From 647e0dca2a67641e0e10885561972948b2c98881 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Tue, 30 Sep 2025 13:42:31 -0700
Subject: [PATCH 1/2] Bump github/gh-base-image/gh-base-noble from
 20250924-191915-gc04d4a50b to 20250929-093120-g65a62eb8c in the baseimages
 group (#57742)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
---
 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index d172f5620ab9..04d6509f67f2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@
 # ---------------------------------------------------------------
 # To update the sha:
 # https://github.com/github/gh-base-image/pkgs/container/gh-base-image%2Fgh-base-noble
-FROM ghcr.io/github/gh-base-image/gh-base-noble:20250924-191915-gc04d4a50b AS base
+FROM ghcr.io/github/gh-base-image/gh-base-noble:20250929-093120-g65a62eb8c AS base
 
 # Install curl for Node install and determining the early access branch
 # Install git for cloning docs-early-access & translations repos

From 501e2512d763df01ddb630c4e7749934e425acf7 Mon Sep 17 00:00:00 2001
From: Kevin Heis <heiskr@users.noreply.github.com>
Date: Tue, 30 Sep 2025 13:44:12 -0700
Subject: [PATCH 2/2] Convert 27 JavaScript files to TypeScript (#57693)

---
 next.config.js                                | 24 +++++-
 .../lib/helpers/schema-utils.js               | 41 ----------
 .../lib/helpers/schema-utils.ts               | 79 +++++++++++++++++++
 ...den-docs.js => frontmatter-hidden-docs.ts} |  7 +-
 ...s.js => github-owned-action-references.ts} |  6 +-
 ...variable.js => hardcoded-data-variable.ts} |  6 +-
 ...n.js => image-alt-text-end-punctuation.ts} |  5 +-
 ...ext-length.js => image-alt-text-length.ts} | 13 ++-
 ...ink-punctuation.js => link-punctuation.ts} |  6 +-
 ...ack-liquid.js => learning-track-liquid.ts} |  9 ++-
 ...ode-annotations.js => code-annotations.ts} |  0
 ...den-docs.js => frontmatter-hidden-docs.ts} |  0
 ...ext-length.js => image-alt-text-length.ts} |  7 +-
 ...kebab-case.js => image-file-kebab-case.ts} |  0
 .../unit/{image-no-gif.js => image-no-gif.ts} |  0
 ...s-no-lang.js => internal-links-no-lang.ts} |  5 +-
 ...rsion.js => internal-links-old-version.ts} |  5 +-
 .../{link-quotation.js => link-quotation.ts}  |  9 ++-
 src/content-render/liquid/spotlight.js        | 36 ---------
 src/content-render/liquid/spotlight.ts        | 64 +++++++++++++++
 .../unified/rewrite-thead-th-scope.js         | 35 --------
 .../unified/rewrite-thead-th-scope.ts         | 42 ++++++++++
 ...{learning-tracks.js => learning-tracks.ts} |  2 +-
 src/frame/lib/{constants.js => constants.ts}  |  0
 .../{get-toc-items.js => get-toc-items.ts}    | 42 +++++++---
 src/frame/tests/{content.js => content.ts}    | 21 +++--
 .../tests/{find-page.js => find-page.ts}      | 14 +++-
 ...rocess-previews.js => process-previews.ts} | 24 +++++-
 .../lib/{log-levels.js => log-levels.ts}      | 18 ++++-
 .../{get-redirects.js => get-redirects.ts}    | 30 +++++--
 ...ise-versions.js => enterprise-versions.ts} |  0
 31 files changed, 374 insertions(+), 176 deletions(-)
 delete mode 100644 src/content-linter/lib/helpers/schema-utils.js
 create mode 100644 src/content-linter/lib/helpers/schema-utils.ts
 rename src/content-linter/lib/linting-rules/{frontmatter-hidden-docs.js => frontmatter-hidden-docs.ts} (79%)
 rename src/content-linter/lib/linting-rules/{github-owned-action-references.js => github-owned-action-references.ts} (83%)
 rename src/content-linter/lib/linting-rules/{hardcoded-data-variable.js => hardcoded-data-variable.ts} (83%)
 rename src/content-linter/lib/linting-rules/{image-alt-text-end-punctuation.js => image-alt-text-end-punctuation.ts} (84%)
 rename src/content-linter/lib/linting-rules/{image-alt-text-length.js => image-alt-text-length.ts} (81%)
 rename src/content-linter/lib/linting-rules/{link-punctuation.js => link-punctuation.ts} (81%)
 rename src/content-linter/tests/{learning-track-liquid.js => learning-track-liquid.ts} (74%)
 rename src/content-linter/tests/unit/{code-annotations.js => code-annotations.ts} (100%)
 rename src/content-linter/tests/unit/{frontmatter-hidden-docs.js => frontmatter-hidden-docs.ts} (100%)
 rename src/content-linter/tests/unit/{image-alt-text-length.js => image-alt-text-length.ts} (81%)
 rename src/content-linter/tests/unit/{image-file-kebab-case.js => image-file-kebab-case.ts} (100%)
 rename src/content-linter/tests/unit/{image-no-gif.js => image-no-gif.ts} (100%)
 rename src/content-linter/tests/unit/{internal-links-no-lang.js => internal-links-no-lang.ts} (87%)
 rename src/content-linter/tests/unit/{internal-links-old-version.js => internal-links-old-version.ts} (85%)
 rename src/content-linter/tests/unit/{link-quotation.js => link-quotation.ts} (79%)
 delete mode 100644 src/content-render/liquid/spotlight.js
 create mode 100644 src/content-render/liquid/spotlight.ts
 delete mode 100644 src/content-render/unified/rewrite-thead-th-scope.js
 create mode 100644 src/content-render/unified/rewrite-thead-th-scope.ts
 rename src/data-directory/lib/data-schemas/{learning-tracks.js => learning-tracks.ts} (93%)
 rename src/frame/lib/{constants.js => constants.ts} (100%)
 rename src/frame/lib/{get-toc-items.js => get-toc-items.ts} (51%)
 rename src/frame/tests/{content.js => content.ts} (66%)
 rename src/frame/tests/{find-page.js => find-page.ts} (61%)
 rename src/graphql/scripts/utils/{process-previews.js => process-previews.ts} (64%)
 rename src/observability/logger/lib/{log-levels.js => log-levels.ts} (67%)
 rename src/rest/scripts/utils/{get-redirects.js => get-redirects.ts} (61%)
 rename src/versions/tests/{enterprise-versions.js => enterprise-versions.ts} (100%)

diff --git a/next.config.js b/next.config.js
index 3a5a2073570a..3e0720539bb1 100644
--- a/next.config.js
+++ b/next.config.js
@@ -2,7 +2,29 @@ import fs from 'fs'
 import path from 'path'
 
 import frontmatter from '@gr2m/gray-matter'
-import { getLogLevelNumber } from './src/observability/logger/lib/log-levels.js'
+// Hardcoded log level function since next.config.js cannot import from TypeScript files
+// Matches ./src/observability/logger/lib/log-levels
+function getLogLevelNumber() {
+  const LOG_LEVELS = {
+    error: 0,
+    warn: 1,
+    info: 2,
+    debug: 3,
+  }
+
+  let defaultLogLevel = 'info'
+  if (
+    !process.env.LOG_LEVEL &&
+    (process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test')
+  ) {
+    defaultLogLevel = 'debug'
+  }
+
+  const envLogLevel = process.env.LOG_LEVEL?.toLowerCase() || defaultLogLevel
+  const logLevel = LOG_LEVELS[envLogLevel] !== undefined ? envLogLevel : defaultLogLevel
+
+  return LOG_LEVELS[logLevel]
+}
 
 // Replace imports with hardcoded values
 const ROOT = process.env.ROOT || '.'
diff --git a/src/content-linter/lib/helpers/schema-utils.js b/src/content-linter/lib/helpers/schema-utils.js
deleted file mode 100644
index 95b302bf3eec..000000000000
--- a/src/content-linter/lib/helpers/schema-utils.js
+++ /dev/null
@@ -1,41 +0,0 @@
-// This function takes an array of AJV errors and formats them
-// in a way that is more compatible with Markdownlint errors.
-export function formatAjvErrors(errors = []) {
-  return errors.map((errorObj) => {
-    const error = {}
-
-    // An instancePath is either blank or starts with a slash
-    // and separates object properties with slashes. A more
-    // common way to read object nesting is using dot notation.
-    error.instancePath =
-      errorObj.instancePath === ''
-        ? errorObj.instancePath
-        : errorObj.instancePath.slice(1).replace('/', '.')
-
-    if (errorObj.keyword === 'additionalProperties') {
-      error.detail = 'The frontmatter includes an unsupported property.'
-      const pathContext = error.instancePath ? ` from \`${error.instancePath}\`` : ''
-      error.context = `Remove the property \`${errorObj.params.additionalProperty}\`${pathContext}.`
-      error.errorProperty = errorObj.params.additionalProperty
-      error.searchProperty = error.errorProperty
-      return error
-    }
-
-    if (errorObj.keyword === 'required') {
-      error.detail = 'The frontmatter has a missing required property'
-      const pathContext = error.instancePath ? ` from \`${error.instancePath}\`` : ''
-      error.context = `Add the missing property \`${errorObj.params.missingProperty}\`${pathContext}`
-      error.errorProperty = errorObj.params.missingProperty
-      error.searchProperty = error.instancePath.split('.').pop()
-      return error
-    }
-
-    // The two most common errors are required and additionalProperties.
-    // This catches any other with a generic detail that uses the AJV wording.
-    error.detail = `Frontmatter ${errorObj.message}.`
-    error.context = Object.values(errorObj.params).join('')
-    error.errorProperty = error.context
-    error.searchProperty = error.errorProperty
-    return error
-  })
-}
diff --git a/src/content-linter/lib/helpers/schema-utils.ts b/src/content-linter/lib/helpers/schema-utils.ts
new file mode 100644
index 000000000000..86cdc3c287db
--- /dev/null
+++ b/src/content-linter/lib/helpers/schema-utils.ts
@@ -0,0 +1,79 @@
+import { getFrontmatter } from './utils'
+
+// AJV validation error object structure
+interface AjvValidationError {
+  instancePath: string
+  keyword: string
+  message: string
+  params: {
+    additionalProperty?: string
+    missingProperty?: string
+    [key: string]: unknown
+  }
+}
+
+// Processed error object for markdown linting
+interface ProcessedValidationError {
+  instancePath: string
+  detail: string
+  context: string
+  errorProperty: string
+  searchProperty: string
+}
+
+export function formatAjvErrors(errors: AjvValidationError[] = []): ProcessedValidationError[] {
+  const processedErrors: ProcessedValidationError[] = []
+
+  errors.forEach((errorObj: AjvValidationError) => {
+    const error: Partial<ProcessedValidationError> = {}
+
+    error.instancePath =
+      errorObj.instancePath === ''
+        ? errorObj.instancePath
+        : errorObj.instancePath.slice(1).replace('/', '.')
+
+    if (errorObj.keyword === 'additionalProperties') {
+      error.detail = 'The frontmatter includes an unsupported property.'
+      const pathContext = error.instancePath ? ` from \`${error.instancePath}\`` : ''
+      error.context = `Remove the property \`${errorObj.params.additionalProperty}\`${pathContext}.`
+      error.errorProperty = errorObj.params.additionalProperty
+      error.searchProperty = error.errorProperty
+    }
+
+    // required rule
+    if (errorObj.keyword === 'required') {
+      error.detail = 'The frontmatter has a missing required property'
+      const pathContext = error.instancePath ? ` from \`${error.instancePath}\`` : ''
+      error.context = `Add the missing property \`${errorObj.params.missingProperty}\`${pathContext}`
+      error.errorProperty = errorObj.params.missingProperty
+      error.searchProperty = error.instancePath.split('.').pop()
+    }
+
+    // all other rules
+    if (!error.detail) {
+      error.detail = `Frontmatter ${errorObj.message}.`
+      error.context = Object.values(errorObj.params).join('')
+      error.errorProperty = error.context
+      error.searchProperty = error.errorProperty
+    }
+
+    processedErrors.push(error as ProcessedValidationError)
+  })
+
+  return processedErrors
+}
+
+// Alias for backward compatibility
+export const processSchemaValidationErrors = formatAjvErrors
+
+// Schema validator interface - generic due to different schema types (AJV, JSON Schema, etc.)
+interface SchemaValidator {
+  validate(data: unknown): boolean
+}
+
+export function getSchemaValidator(
+  frontmatterLines: string[],
+): (schema: SchemaValidator) => boolean {
+  const frontmatter = getFrontmatter(frontmatterLines)
+  return (schema: SchemaValidator) => schema.validate(frontmatter)
+}
diff --git a/src/content-linter/lib/linting-rules/frontmatter-hidden-docs.js b/src/content-linter/lib/linting-rules/frontmatter-hidden-docs.ts
similarity index 79%
rename from src/content-linter/lib/linting-rules/frontmatter-hidden-docs.js
rename to src/content-linter/lib/linting-rules/frontmatter-hidden-docs.ts
index 73f07184ed99..cdc9289da9cf 100644
--- a/src/content-linter/lib/linting-rules/frontmatter-hidden-docs.js
+++ b/src/content-linter/lib/linting-rules/frontmatter-hidden-docs.ts
@@ -1,4 +1,6 @@
+// @ts-ignore - markdownlint-rule-helpers doesn't have TypeScript declarations
 import { addError } from 'markdownlint-rule-helpers'
+import type { RuleParams, RuleErrorCallback } from '../../types'
 
 import { getFrontmatter } from '../helpers/utils'
 
@@ -7,7 +9,7 @@ export const frontmatterHiddenDocs = {
   description:
     'Articles with frontmatter property `hidden` can only be located in specific products',
   tags: ['frontmatter', 'feature', 'early-access'],
-  function: (params, onError) => {
+  function: (params: RuleParams, onError: RuleErrorCallback) => {
     const fm = getFrontmatter(params.lines)
     if (!fm || !fm.hidden) return
 
@@ -24,7 +26,8 @@ export const frontmatterHiddenDocs = {
 
     if (allowedProductPaths.some((allowedPath) => params.name.includes(allowedPath))) return
 
-    const hiddenLine = params.lines.find((line) => line.startsWith('hidden:'))
+    const hiddenLine = params.lines.find((line: string) => line.startsWith('hidden:'))
+    if (!hiddenLine) return
     const lineNumber = params.lines.indexOf(hiddenLine) + 1
 
     addError(
diff --git a/src/content-linter/lib/linting-rules/github-owned-action-references.js b/src/content-linter/lib/linting-rules/github-owned-action-references.ts
similarity index 83%
rename from src/content-linter/lib/linting-rules/github-owned-action-references.js
rename to src/content-linter/lib/linting-rules/github-owned-action-references.ts
index 204bf2237153..797e1c88c34d 100644
--- a/src/content-linter/lib/linting-rules/github-owned-action-references.js
+++ b/src/content-linter/lib/linting-rules/github-owned-action-references.ts
@@ -1,16 +1,18 @@
+// @ts-ignore - markdownlint-rule-helpers doesn't have TypeScript declarations
 import { addError, ellipsify } from 'markdownlint-rule-helpers'
+import type { RuleParams, RuleErrorCallback } from '../../types'
 
 import { getRange } from '../helpers/utils'
 /*
   This rule currently only checks for one hardcoded string but
-  can be generalized in the future to check for strings that 
+  can be generalized in the future to check for strings that
   have data reusables.
 */
 export const githubOwnedActionReferences = {
   names: ['GHD013', 'github-owned-action-references'],
   description: 'GitHub-owned action references should not be hardcoded',
   tags: ['feature', 'actions'],
-  function: (params, onError) => {
+  function: (params: RuleParams, onError: RuleErrorCallback) => {
     const filepath = params.name
     if (filepath.startsWith('data/reusables/actions/action-')) return
 
diff --git a/src/content-linter/lib/linting-rules/hardcoded-data-variable.js b/src/content-linter/lib/linting-rules/hardcoded-data-variable.ts
similarity index 83%
rename from src/content-linter/lib/linting-rules/hardcoded-data-variable.js
rename to src/content-linter/lib/linting-rules/hardcoded-data-variable.ts
index 08b72c20ddea..e039d3debe3f 100644
--- a/src/content-linter/lib/linting-rules/hardcoded-data-variable.js
+++ b/src/content-linter/lib/linting-rules/hardcoded-data-variable.ts
@@ -1,11 +1,13 @@
+// @ts-ignore - markdownlint-rule-helpers doesn't have TypeScript declarations
 import { addError, ellipsify } from 'markdownlint-rule-helpers'
+import type { RuleParams, RuleErrorCallback } from '../../types'
 
 import { getRange } from '../helpers/utils'
 import frontmatter from '@/frame/lib/read-frontmatter'
 
 /*
   This rule currently only checks for one hardcoded string but
-  can be generalized in the future to check for strings that 
+  can be generalized in the future to check for strings that
   have data variables.
 */
 export const hardcodedDataVariable = {
@@ -13,7 +15,7 @@ export const hardcodedDataVariable = {
   description:
     'Strings that contain "personal access token" should use the product variable instead',
   tags: ['single-source'],
-  function: (params, onError) => {
+  function: (params: RuleParams, onError: RuleErrorCallback) => {
     if (params.name.startsWith('data/variables/product.yml')) return
     const frontmatterString = params.frontMatterLines.join('\n')
     const fm = frontmatter(frontmatterString).data
diff --git a/src/content-linter/lib/linting-rules/image-alt-text-end-punctuation.js b/src/content-linter/lib/linting-rules/image-alt-text-end-punctuation.ts
similarity index 84%
rename from src/content-linter/lib/linting-rules/image-alt-text-end-punctuation.js
rename to src/content-linter/lib/linting-rules/image-alt-text-end-punctuation.ts
index 829374722ef2..520a09e51e86 100644
--- a/src/content-linter/lib/linting-rules/image-alt-text-end-punctuation.js
+++ b/src/content-linter/lib/linting-rules/image-alt-text-end-punctuation.ts
@@ -5,14 +5,15 @@ import {
   isStringQuoted,
   isStringPunctuated,
 } from '../helpers/utils'
+import type { RuleParams, RuleErrorCallback } from '../../types'
 
 export const imageAltTextEndPunctuation = {
   names: ['GHD032', 'image-alt-text-end-punctuation'],
   description: 'Alternate text for images should end with punctuation',
   tags: ['accessibility', 'images'],
   parser: 'markdownit',
-  function: (params, onError) => {
-    forEachInlineChild(params, 'image', function forToken(token) {
+  function: (params: RuleParams, onError: RuleErrorCallback) => {
+    forEachInlineChild(params, 'image', function forToken(token: any) {
       const imageAltText = token.content.trim()
 
       // If the alt text is empty, there is nothing to check and you can't
diff --git a/src/content-linter/lib/linting-rules/image-alt-text-length.js b/src/content-linter/lib/linting-rules/image-alt-text-length.ts
similarity index 81%
rename from src/content-linter/lib/linting-rules/image-alt-text-length.js
rename to src/content-linter/lib/linting-rules/image-alt-text-length.ts
index 80d2a04a5a99..043ba270827e 100644
--- a/src/content-linter/lib/linting-rules/image-alt-text-length.js
+++ b/src/content-linter/lib/linting-rules/image-alt-text-length.ts
@@ -1,17 +1,26 @@
+// @ts-ignore - markdownlint-rule-helpers doesn't have TypeScript declarations
 import { addError } from 'markdownlint-rule-helpers'
+import type { RuleParams, RuleErrorCallback } from '../../types'
 
 import { liquid } from '@/content-render/index'
 import { allVersions } from '@/versions/lib/all-versions'
 import { forEachInlineChild, getRange } from '../helpers/utils'
 
+interface ImageToken {
+  content: string
+  lineNumber: number
+  line: string
+  range: [number, number]
+}
+
 export const incorrectAltTextLength = {
   names: ['GHD033', 'incorrect-alt-text-length'],
   description: 'Images alternate text should be between 40-150 characters',
   tags: ['accessibility', 'images'],
   parser: 'markdownit',
   asynchronous: true,
-  function: (params, onError) => {
-    forEachInlineChild(params, 'image', async function forToken(token) {
+  function: (params: RuleParams, onError: RuleErrorCallback) => {
+    forEachInlineChild(params, 'image', async function forToken(token: ImageToken) {
       let renderedString = token.content
 
       if (token.content.includes('{%') || token.content.includes('{{')) {
diff --git a/src/content-linter/lib/linting-rules/link-punctuation.js b/src/content-linter/lib/linting-rules/link-punctuation.ts
similarity index 81%
rename from src/content-linter/lib/linting-rules/link-punctuation.js
rename to src/content-linter/lib/linting-rules/link-punctuation.ts
index 669f34944807..778a92782ade 100644
--- a/src/content-linter/lib/linting-rules/link-punctuation.js
+++ b/src/content-linter/lib/linting-rules/link-punctuation.ts
@@ -1,4 +1,6 @@
+// @ts-ignore - markdownlint-rule-helpers doesn't have TypeScript declarations
 import { addError, filterTokens } from 'markdownlint-rule-helpers'
+import type { RuleParams, RuleErrorCallback } from '../../types'
 
 import { doesStringEndWithPeriod, getRange, isStringQuoted } from '../helpers/utils'
 
@@ -7,8 +9,8 @@ export const linkPunctuation = {
   description: 'Internal link titles must not contain punctuation',
   tags: ['links', 'url'],
   parser: 'markdownit',
-  function: (params, onError) => {
-    filterTokens(params, 'inline', (token) => {
+  function: (params: RuleParams, onError: RuleErrorCallback) => {
+    filterTokens(params, 'inline', (token: any) => {
       const { children, line } = token
       let inLink = false
       for (const child of children) {
diff --git a/src/content-linter/tests/learning-track-liquid.js b/src/content-linter/tests/learning-track-liquid.ts
similarity index 74%
rename from src/content-linter/tests/learning-track-liquid.js
rename to src/content-linter/tests/learning-track-liquid.ts
index b71a4b997a88..a9e6e69f5611 100644
--- a/src/content-linter/tests/learning-track-liquid.js
+++ b/src/content-linter/tests/learning-track-liquid.ts
@@ -18,7 +18,8 @@ describe('lint learning tracks', () => {
   if (yamlFileList.length < 1) return
 
   describe.each(yamlFileList)('%s', (yamlAbsPath) => {
-    let yamlContent
+    // Using any type because YAML content structure is dynamic and varies per file
+    let yamlContent: any
 
     beforeAll(async () => {
       const fileContents = await readFile(yamlAbsPath, 'utf8')
@@ -26,8 +27,10 @@ describe('lint learning tracks', () => {
     })
 
     test('contains valid liquid', () => {
-      const toLint = []
-      Object.values(yamlContent).forEach(({ title, description }) => {
+      // Using any[] for toLint since it contains mixed string content from various YAML properties
+      const toLint: any[] = []
+      // Using any for destructured params as YAML structure varies across different learning track files
+      Object.values(yamlContent).forEach(({ title, description }: any) => {
         toLint.push(title)
         toLint.push(description)
       })
diff --git a/src/content-linter/tests/unit/code-annotations.js b/src/content-linter/tests/unit/code-annotations.ts
similarity index 100%
rename from src/content-linter/tests/unit/code-annotations.js
rename to src/content-linter/tests/unit/code-annotations.ts
diff --git a/src/content-linter/tests/unit/frontmatter-hidden-docs.js b/src/content-linter/tests/unit/frontmatter-hidden-docs.ts
similarity index 100%
rename from src/content-linter/tests/unit/frontmatter-hidden-docs.js
rename to src/content-linter/tests/unit/frontmatter-hidden-docs.ts
diff --git a/src/content-linter/tests/unit/image-alt-text-length.js b/src/content-linter/tests/unit/image-alt-text-length.ts
similarity index 81%
rename from src/content-linter/tests/unit/image-alt-text-length.js
rename to src/content-linter/tests/unit/image-alt-text-length.ts
index 1e186bca150d..5990c3d10416 100644
--- a/src/content-linter/tests/unit/image-alt-text-length.js
+++ b/src/content-linter/tests/unit/image-alt-text-length.ts
@@ -2,6 +2,7 @@ import { describe, expect, test } from 'vitest'
 
 import { runRule } from '../../lib/init-test'
 import { incorrectAltTextLength } from '../../lib/linting-rules/image-alt-text-length'
+import type { Rule } from '../../types'
 
 describe(incorrectAltTextLength.names.join(' - '), () => {
   test('image with incorrect alt text length fails', async () => {
@@ -9,7 +10,7 @@ describe(incorrectAltTextLength.names.join(' - '), () => {
       `![${'x'.repeat(39)}](./image.png)`,
       `![${'x'.repeat(151)}](./image.png)`,
     ].join('\n')
-    const result = await runRule(incorrectAltTextLength, { strings: { markdown } })
+    const result = await runRule(incorrectAltTextLength as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(2)
     expect(errors[0].lineNumber).toBe(1)
@@ -22,7 +23,7 @@ describe(incorrectAltTextLength.names.join(' - '), () => {
       `![${'x'.repeat(40)}](./image.png)`,
       `![${'x'.repeat(150)}](./image.png)`,
     ].join('\n')
-    const result = await runRule(incorrectAltTextLength, { strings: { markdown } })
+    const result = await runRule(incorrectAltTextLength as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(0)
   })
@@ -33,7 +34,7 @@ describe(incorrectAltTextLength.names.join(' - '), () => {
       // Completely empty
       '![](/images/this-is-ok.png)',
     ].join('\n')
-    const result = await runRule(incorrectAltTextLength, { strings: { markdown } })
+    const result = await runRule(incorrectAltTextLength as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(1)
     expect(errors[0].lineNumber).toBe(3)
diff --git a/src/content-linter/tests/unit/image-file-kebab-case.js b/src/content-linter/tests/unit/image-file-kebab-case.ts
similarity index 100%
rename from src/content-linter/tests/unit/image-file-kebab-case.js
rename to src/content-linter/tests/unit/image-file-kebab-case.ts
diff --git a/src/content-linter/tests/unit/image-no-gif.js b/src/content-linter/tests/unit/image-no-gif.ts
similarity index 100%
rename from src/content-linter/tests/unit/image-no-gif.js
rename to src/content-linter/tests/unit/image-no-gif.ts
diff --git a/src/content-linter/tests/unit/internal-links-no-lang.js b/src/content-linter/tests/unit/internal-links-no-lang.ts
similarity index 87%
rename from src/content-linter/tests/unit/internal-links-no-lang.js
rename to src/content-linter/tests/unit/internal-links-no-lang.ts
index 206a5e7755f5..e883adf5a55c 100644
--- a/src/content-linter/tests/unit/internal-links-no-lang.js
+++ b/src/content-linter/tests/unit/internal-links-no-lang.ts
@@ -2,6 +2,7 @@ import { describe, expect, test } from 'vitest'
 
 import { runRule } from '../../lib/init-test'
 import { internalLinksNoLang } from '../../lib/linting-rules/internal-links-no-lang'
+import type { Rule } from '../../types'
 
 describe(internalLinksNoLang.names.join(' - '), () => {
   test('internal links with hardcoded language codes fail', async () => {
@@ -10,7 +11,7 @@ describe(internalLinksNoLang.names.join(' - '), () => {
       '[Link to just a landing page in english](/en)',
       '[Korean Docs](/ko/actions)',
     ].join('\n')
-    const result = await runRule(internalLinksNoLang, { strings: { markdown } })
+    const result = await runRule(internalLinksNoLang as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(3)
     expect(errors.map((error) => error.lineNumber)).toEqual([1, 2, 3])
@@ -31,7 +32,7 @@ describe(internalLinksNoLang.names.join(' - '), () => {
       // A link that starts with a language code
       '[Enterprise](/enterprise/overview)',
     ].join('\n')
-    const result = await runRule(internalLinksNoLang, { strings: { markdown } })
+    const result = await runRule(internalLinksNoLang as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(0)
   })
diff --git a/src/content-linter/tests/unit/internal-links-old-version.js b/src/content-linter/tests/unit/internal-links-old-version.ts
similarity index 85%
rename from src/content-linter/tests/unit/internal-links-old-version.js
rename to src/content-linter/tests/unit/internal-links-old-version.ts
index b40909e66474..84c0510dd77e 100644
--- a/src/content-linter/tests/unit/internal-links-old-version.js
+++ b/src/content-linter/tests/unit/internal-links-old-version.ts
@@ -2,6 +2,7 @@ import { describe, expect, test } from 'vitest'
 
 import { runRule } from '../../lib/init-test'
 import { internalLinksOldVersion } from '../../lib/linting-rules/internal-links-old-version'
+import type { Rule } from '../../types'
 
 describe(internalLinksOldVersion.names.join(' - '), () => {
   test('links with old hardcoded versioning fail', async () => {
@@ -10,7 +11,7 @@ describe(internalLinksOldVersion.names.join(' - '), () => {
       '[Link to Enterprise 11.10.340](https://docs.github.com/enterprise/11.10.340/admin/yes)',
       '[Enterprise 2.8](http://help.github.com/enterprise/2.8/admin/)',
     ].join('\n')
-    const result = await runRule(internalLinksOldVersion, { strings: { markdown } })
+    const result = await runRule(internalLinksOldVersion as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(3)
     expect(errors.map((error) => error.lineNumber)).toEqual([1, 2, 3])
@@ -26,7 +27,7 @@ describe(internalLinksOldVersion.names.join(' - '), () => {
       // Current versioning links is excluded from this test
       '[New versioning](/github/site-policy/enterprise/2.2/yes)',
     ].join('\n')
-    const result = await runRule(internalLinksOldVersion, { strings: { markdown } })
+    const result = await runRule(internalLinksOldVersion as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(0)
   })
diff --git a/src/content-linter/tests/unit/link-quotation.js b/src/content-linter/tests/unit/link-quotation.ts
similarity index 79%
rename from src/content-linter/tests/unit/link-quotation.js
rename to src/content-linter/tests/unit/link-quotation.ts
index 52d57ab19f32..1e160672f691 100644
--- a/src/content-linter/tests/unit/link-quotation.js
+++ b/src/content-linter/tests/unit/link-quotation.ts
@@ -2,6 +2,7 @@ import { describe, expect, test } from 'vitest'
 
 import { runRule } from '../../lib/init-test'
 import { linkQuotation } from '../../lib/linting-rules/link-quotation'
+import type { Rule } from '../../types'
 
 describe(linkQuotation.names.join(' - '), () => {
   test('links that are formatted correctly should not generate an error', async () => {
@@ -9,7 +10,7 @@ describe(linkQuotation.names.join(' - '), () => {
       'Random stuff [A title](./image.png)',
       '"This is a direct quote" [A title](./image.png)',
     ].join('\n')
-    const result = await runRule(linkQuotation, { strings: { markdown } })
+    const result = await runRule(linkQuotation as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(0)
   })
@@ -26,11 +27,11 @@ describe(linkQuotation.names.join(' - '), () => {
       'See "[AUTOTITLE](/foo/bar)," "[AUTOTITLE](/foo/bar2)," "[AUTOTITLE](/foo/bar3)," and "[AUTOTITLE](/foo/bar4)."',
       'See "[Anchor link](#anchor-link)."',
     ].join('\n')
-    const result = await runRule(linkQuotation, { strings: { markdown } })
+    const result = await runRule(linkQuotation as Rule, { strings: { markdown } })
     const errors = result.markdown
     expect(errors.length).toBe(13)
     expect(errors[0].errorRange).toEqual([14, 25])
-    expect(errors[0].fixInfo.insertText).toBe('[A title](./image.png).')
-    expect(errors[1].fixInfo.insertText).toBe('[A title](./image.png)?')
+    expect(errors[0].fixInfo?.insertText).toBe('[A title](./image.png).')
+    expect(errors[1].fixInfo?.insertText).toBe('[A title](./image.png)?')
   })
 })
diff --git a/src/content-render/liquid/spotlight.js b/src/content-render/liquid/spotlight.js
deleted file mode 100644
index 86c1d79476b3..000000000000
--- a/src/content-render/liquid/spotlight.js
+++ /dev/null
@@ -1,36 +0,0 @@
-export const tags = {
-  note: 'accent',
-  tip: 'success',
-  warning: 'attention',
-  danger: 'danger',
-}
-
-const template =
-  '<div class="ghd-alert ghd-alert-{{ color }} ghd-spotlight-{{ color }}">{{ output }}</div>'
-
-export const Spotlight = {
-  type: 'block',
-
-  parse(tagToken, remainTokens) {
-    this.tagName = tagToken.name
-    this.templates = []
-
-    const stream = this.liquid.parser.parseStream(remainTokens)
-    stream
-      .on(`tag:end${this.tagName}`, () => stream.stop())
-      .on('template', (tpl) => this.templates.push(tpl))
-      .on('end', () => {
-        throw new Error(`tag ${tagToken.getText()} not closed`)
-      })
-    stream.start()
-  },
-
-  render: function* (scope) {
-    const output = yield this.liquid.renderer.renderTemplates(this.templates, scope)
-
-    return yield this.liquid.parseAndRender(template, {
-      color: tags[this.tagName],
-      output,
-    })
-  },
-}
diff --git a/src/content-render/liquid/spotlight.ts b/src/content-render/liquid/spotlight.ts
new file mode 100644
index 000000000000..3a895714092b
--- /dev/null
+++ b/src/content-render/liquid/spotlight.ts
@@ -0,0 +1,64 @@
+interface LiquidToken {
+  name: string
+  getText(): string
+}
+
+interface LiquidTemplate {
+  [key: string]: unknown
+}
+
+interface LiquidStream {
+  on(event: string, callback: () => void): LiquidStream
+  stop(): void
+  start(): void
+}
+
+interface LiquidEngine {
+  parser: {
+    parseStream(tokens: LiquidToken[]): LiquidStream
+  }
+  renderer: {
+    renderTemplates(templates: LiquidTemplate[], scope: Record<string, unknown>): string
+  }
+  parseAndRender(template: string, context: Record<string, string>): string
+}
+
+export const tags: Record<string, string> = {
+  note: 'accent',
+  tip: 'success',
+  warning: 'attention',
+  danger: 'danger',
+}
+
+const template: string =
+  '<div class="ghd-alert ghd-alert-{{ color }} ghd-spotlight-{{ color }}">{{ output }}</div>'
+
+export const Spotlight = {
+  type: 'block' as const,
+  tagName: '' as string,
+  templates: [] as LiquidTemplate[],
+  liquid: null as LiquidEngine | null,
+
+  parse(tagToken: LiquidToken, remainTokens: LiquidToken[]): void {
+    this.tagName = tagToken.name
+    this.templates = []
+
+    const stream = this.liquid!.parser.parseStream(remainTokens)
+    stream
+      .on(`tag:end${this.tagName}`, () => stream.stop())
+      .on('template', (tpl: LiquidTemplate) => this.templates.push(tpl))
+      .on('end', () => {
+        throw new Error(`tag ${tagToken.getText()} not closed`)
+      })
+    stream.start()
+  },
+
+  render: function* (scope: Record<string, unknown>): Generator<unknown, unknown, unknown> {
+    const output = yield this.liquid!.renderer.renderTemplates(this.templates, scope)
+
+    return yield this.liquid!.parseAndRender(template, {
+      color: tags[this.tagName],
+      output,
+    })
+  },
+}
diff --git a/src/content-render/unified/rewrite-thead-th-scope.js b/src/content-render/unified/rewrite-thead-th-scope.js
deleted file mode 100644
index e5cd5c4d810a..000000000000
--- a/src/content-render/unified/rewrite-thead-th-scope.js
+++ /dev/null
@@ -1,35 +0,0 @@
-import { visitParents } from 'unist-util-visit-parents'
-
-/**
- * Where it can mutate the AST to swap from:
- *
- *   <thead>
- *     <tr>
- *       <th>...</th>
- *       <th>...</th>
- *
- * to:
- *   <thead>
- *     <tr>
- *       <th scope="col">...</th>
- *       <th scope="col">...</th>
- *
- * */
-
-function matcher(node) {
-  return node.type === 'element' && node.tagName === 'th' && !('scope' in node.properties)
-}
-
-function visitor(node, ancestors) {
-  const parent = ancestors.at(-1)
-  if (parent && parent.tagName === 'tr') {
-    const grandParent = ancestors.at(-2)
-    if (grandParent && grandParent.tagName === 'thead') {
-      node.properties.scope = 'col'
-    }
-  }
-}
-
-export default function rewriteTheadThScope() {
-  return (tree) => visitParents(tree, matcher, visitor)
-}
diff --git a/src/content-render/unified/rewrite-thead-th-scope.ts b/src/content-render/unified/rewrite-thead-th-scope.ts
new file mode 100644
index 000000000000..25ac2f9f15be
--- /dev/null
+++ b/src/content-render/unified/rewrite-thead-th-scope.ts
@@ -0,0 +1,42 @@
+import { visitParents } from 'unist-util-visit-parents'
+import type { Root } from 'hast'
+import type { Transformer } from 'unified'
+
+/**
+ * Where it can mutate the AST to swap from:
+ *
+ *   <thead>
+ *     <tr>
+ *       <th>...</th>
+ *       <th>...</th>
+ *
+ * to:
+ *   <thead>
+ *     <tr>
+ *       <th scope="col">...</th>
+ *       <th scope="col">...</th>
+ *
+ * */
+
+function matcher(node: any): boolean {
+  // Using any type due to complex type conflicts between different versions of
+  // @types/hast and @types/unist used by various dependencies. The node should be
+  // an Element with tagName 'th' and no existing 'scope' property.
+  return node.type === 'element' && node.tagName === 'th' && !('scope' in node.properties)
+}
+
+function visitor(node: any, ancestors: any[]): void {
+  // Using any type for the same reason as matcher - complex type conflicts between
+  // hast/unist type definitions across different package versions
+  const parent = ancestors.at(-1)
+  if (parent && parent.tagName === 'tr') {
+    const grandParent = ancestors.at(-2)
+    if (grandParent && grandParent.tagName === 'thead') {
+      node.properties.scope = 'col'
+    }
+  }
+}
+
+export default function rewriteTheadThScope(): Transformer<Root> {
+  return (tree: Root) => visitParents(tree, matcher, visitor)
+}
diff --git a/src/data-directory/lib/data-schemas/learning-tracks.js b/src/data-directory/lib/data-schemas/learning-tracks.ts
similarity index 93%
rename from src/data-directory/lib/data-schemas/learning-tracks.js
rename to src/data-directory/lib/data-schemas/learning-tracks.ts
index dcab4841cc74..765acc01251c 100644
--- a/src/data-directory/lib/data-schemas/learning-tracks.js
+++ b/src/data-directory/lib/data-schemas/learning-tracks.ts
@@ -2,7 +2,7 @@ import { schema } from '@/frame/lib/frontmatter'
 
 // Some learning tracks have `versions` blocks that match `versions` frontmatter,
 // so we can import that part of the FM schema.
-const versionsProps = Object.assign({}, schema.properties.versions)
+const versionsProps = Object.assign({}, (schema.properties as any).versions)
 
 // `versions` are not required in learning tracks the way they are in FM.
 delete versionsProps.required
diff --git a/src/frame/lib/constants.js b/src/frame/lib/constants.ts
similarity index 100%
rename from src/frame/lib/constants.js
rename to src/frame/lib/constants.ts
diff --git a/src/frame/lib/get-toc-items.js b/src/frame/lib/get-toc-items.ts
similarity index 51%
rename from src/frame/lib/get-toc-items.js
rename to src/frame/lib/get-toc-items.ts
index fb0e6964e418..4cd40eb0ba8f 100644
--- a/src/frame/lib/get-toc-items.js
+++ b/src/frame/lib/get-toc-items.ts
@@ -1,4 +1,15 @@
 import { productMap } from '@/products/lib/all-products'
+
+interface TocItem {
+  type: 'category' | 'subcategory' | 'article'
+  href: string
+}
+
+interface Page {
+  relativePath: string
+  markdown: string
+}
+
 const productTOCs = Object.values(productMap)
   .filter((product) => !product.external)
   .map((product) => product.toc.replace('content/', ''))
@@ -7,7 +18,7 @@ const linkString = /{% [^}]*?link.*? \/(.*?) ?%}/m
 const linksArray = new RegExp(linkString.source, 'gm')
 
 // return an array of objects like { type: 'category|subcategory|article', href: 'path' }
-export default function getTocItems(page) {
+export default function getTocItems(page: Page): TocItem[] | undefined {
   // only process product and category tocs
   if (!page.relativePath.endsWith('index.md')) return
   if (page.relativePath === 'index.md') return
@@ -23,19 +34,24 @@ export default function getTocItems(page) {
     return []
   }
 
-  return rawItems.map((item) => {
-    const tocItem = {}
+  return rawItems
+    .map((item: string) => {
+      const match = item.match(linkString)
+      if (!match) return null
+
+      const tocItem: TocItem = {} as TocItem
 
-    // a product's toc items are always categories
-    // whereas a category's toc items can be either subcategories or articles
-    tocItem.type = productTOCs.includes(page.relativePath)
-      ? 'category'
-      : item.includes('topic_')
-        ? 'subcategory'
-        : 'article'
+      // a product's toc items are always categories
+      // whereas a category's toc items can be either subcategories or articles
+      tocItem.type = productTOCs.includes(page.relativePath)
+        ? 'category'
+        : page.relativePath.includes('/index.md')
+          ? 'subcategory'
+          : 'article'
 
-    tocItem.href = item.match(linkString)[1]
+      tocItem.href = match[1]
 
-    return tocItem
-  })
+      return tocItem
+    })
+    .filter((item): item is TocItem => item !== null)
 }
diff --git a/src/frame/tests/content.js b/src/frame/tests/content.ts
similarity index 66%
rename from src/frame/tests/content.js
rename to src/frame/tests/content.ts
index 543c7dd6a1f7..624d3a81c642 100644
--- a/src/frame/tests/content.js
+++ b/src/frame/tests/content.ts
@@ -5,26 +5,35 @@ import walk from 'walk-sync'
 
 import createTree from '@/frame/lib/create-tree'
 
+interface Page {
+  relativePath: string
+}
+
+interface TreeNode {
+  page: Page
+  childPages?: TreeNode[]
+}
+
 describe('content files', () => {
   test.each(['content', 'src/fixtures/fixtures/content'])(
     'no content files left orphaned without being in the tree in %s',
-    async (contentDir) => {
+    async (contentDir: string) => {
       const tree = await createTree(contentDir)
 
-      const traverse = (node) => {
+      const traverse = (node: TreeNode): string[] => {
         const relativeFiles = [node.page.relativePath]
         for (const child of node.childPages || []) {
           relativeFiles.push(...traverse(child))
         }
         return relativeFiles
       }
-      const relativeFiles = traverse(tree).map((p) => path.join(contentDir, p))
+      const relativeFiles = tree ? traverse(tree).map((p: string) => path.join(contentDir, p)) : []
       const contentFiles = walk(contentDir, { includeBasePath: true, directories: false }).filter(
-        (file) => {
+        (file: string) => {
           return file.endsWith('.md') && !file.includes('README')
         },
-      )
-      const orphanedFiles = contentFiles.filter((file) => !relativeFiles.includes(file))
+      ) as string[]
+      const orphanedFiles = contentFiles.filter((file: string) => !relativeFiles.includes(file))
       expect(
         orphanedFiles.length,
         `${orphanedFiles} orphaned files found on disk but not in site tree`,
diff --git a/src/frame/tests/find-page.js b/src/frame/tests/find-page.ts
similarity index 61%
rename from src/frame/tests/find-page.js
rename to src/frame/tests/find-page.ts
index 160fc438d51d..60189ae9f874 100644
--- a/src/frame/tests/find-page.js
+++ b/src/frame/tests/find-page.ts
@@ -18,7 +18,10 @@ describe('find page', () => {
       languageCode: 'en',
     })
 
-    const englishPermalink = page.permalinks[0].href
+    const englishPermalink = page?.permalinks[0].href
+    if (!page || !englishPermalink) {
+      throw new Error('Page or permalink not found')
+    }
     const redirectToFind = '/some-old-path'
 
     // add named keys
@@ -26,7 +29,12 @@ describe('find page', () => {
       [englishPermalink]: page,
     }
 
-    const redirectedPage = findPage(redirectToFind, pageMap, page.buildRedirects())
-    expect(typeof redirectedPage.title).toBe('string')
+    const redirectedPage = findPage(
+      redirectToFind,
+      pageMap as any, // Using any due to type conflicts between different Page type definitions
+      page.buildRedirects(),
+    )
+    expect(redirectedPage).toBeDefined()
+    expect(typeof redirectedPage?.title).toBe('string')
   })
 })
diff --git a/src/graphql/scripts/utils/process-previews.js b/src/graphql/scripts/utils/process-previews.ts
similarity index 64%
rename from src/graphql/scripts/utils/process-previews.js
rename to src/graphql/scripts/utils/process-previews.ts
index 40b43a52aaaa..b333e9551881 100644
--- a/src/graphql/scripts/utils/process-previews.js
+++ b/src/graphql/scripts/utils/process-previews.ts
@@ -1,11 +1,27 @@
 import { sentenceCase } from 'change-case'
 import GithubSlugger from 'github-slugger'
+
+interface RawPreview {
+  title: string
+  toggled_on: string[]
+  toggled_by: string
+  announcement?: unknown
+  updates?: unknown
+}
+
+interface ProcessedPreview extends Omit<RawPreview, 'announcement' | 'updates'> {
+  accept_header: string
+  href: string
+}
+
 const slugger = new GithubSlugger()
 const inputOrPayload = /(Input|Payload)$/m
 
-export default function processPreviews(previews) {
+export default function processPreviews(previews: RawPreview[]): ProcessedPreview[] {
   // clean up raw yml data
-  previews.forEach((preview) => {
+  // Using any type because we're mutating the preview object to add new properties
+  // that don't exist in the RawPreview interface (accept_header, href)
+  previews.forEach((preview: any) => {
     preview.title = sentenceCase(preview.title)
       .replace(/ -.+/, '') // remove any extra info that follows a hyphen
       .replace('it hub', 'itHub') // fix overcorrected `git hub` from sentenceCasing
@@ -16,7 +32,7 @@ export default function processPreviews(previews) {
 
     // filter out schema members that end in `Input` or `Payload`
     preview.toggled_on = preview.toggled_on.filter(
-      (schemaMember) => !inputOrPayload.test(schemaMember),
+      (schemaMember: string) => !inputOrPayload.test(schemaMember),
     )
 
     // remove unnecessary leading colon
@@ -32,5 +48,5 @@ export default function processPreviews(previews) {
     preview.href = `/graphql/overview/schema-previews#${slugger.slug(preview.title)}`
   })
 
-  return previews
+  return previews as ProcessedPreview[]
 }
diff --git a/src/observability/logger/lib/log-levels.js b/src/observability/logger/lib/log-levels.ts
similarity index 67%
rename from src/observability/logger/lib/log-levels.js
rename to src/observability/logger/lib/log-levels.ts
index d6f5373b2843..6294d4a45dbc 100644
--- a/src/observability/logger/lib/log-levels.js
+++ b/src/observability/logger/lib/log-levels.ts
@@ -12,6 +12,13 @@ export const LOG_LEVELS = {
   warn: 1,
   info: 2,
   debug: 3,
+} as const
+
+type LogLevel = keyof typeof LOG_LEVELS
+type LogLevelValue = (typeof LOG_LEVELS)[LogLevel]
+
+function isValidLogLevel(level: string): level is LogLevel {
+  return level in LOG_LEVELS
 }
 
 // We set the log level based on the LOG_LEVEL environment variable
@@ -19,19 +26,22 @@ export const LOG_LEVELS = {
 //   - 'info' in development
 //   - 'debug' in production
 //   - 'debug' in test - this is because `vitest` turns off logs unless --silent=false is passed
-export function getLogLevelNumber() {
-  let defaultLogLevel = 'info'
+export function getLogLevelNumber(): LogLevelValue {
+  let defaultLogLevel: LogLevel = 'info'
   if (
     !process.env.LOG_LEVEL &&
     (process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test')
   ) {
     defaultLogLevel = 'debug'
   }
-  const logLevel = process.env.LOG_LEVEL?.toLowerCase() || defaultLogLevel
+
+  const envLogLevel = process.env.LOG_LEVEL?.toLowerCase() || defaultLogLevel
+  const logLevel = isValidLogLevel(envLogLevel) ? envLogLevel : defaultLogLevel
+
   return LOG_LEVELS[logLevel]
 }
 
-export const useProductionLogging = () => {
+export const useProductionLogging = (): boolean => {
   return (
     (process.env.NODE_ENV === 'production' && !process.env.CI) ||
     process.env.LOG_LIKE_PRODUCTION === 'true'
diff --git a/src/rest/scripts/utils/get-redirects.js b/src/rest/scripts/utils/get-redirects.ts
similarity index 61%
rename from src/rest/scripts/utils/get-redirects.js
rename to src/rest/scripts/utils/get-redirects.ts
index 6636b0a70d53..db39f3ff44f8 100644
--- a/src/rest/scripts/utils/get-redirects.js
+++ b/src/rest/scripts/utils/get-redirects.ts
@@ -1,10 +1,26 @@
 import { readFile, writeFile } from 'fs/promises'
+
 const STATIC_REDIRECTS = 'src/rest/data/client-side-rest-api-redirects.json'
 const REST_API_OVERRIDES = 'src/rest/lib/rest-api-overrides.json'
 
+interface OperationUrl {
+  originalUrl: string
+  category: string
+  subcategory?: string
+}
+
+interface RestApiOverrides {
+  operationUrls: Record<string, OperationUrl>
+  sectionUrls: Record<string, string>
+}
+
+interface RedirectMap {
+  [oldUrl: string]: string
+}
+
 // This is way to add redirects from one fragment to another from the
 // client's browser.
-export async function syncRestRedirects() {
+export async function syncRestRedirects(): Promise<void> {
   const clientSideRedirects = await getClientSideRedirects()
 
   await writeFile(STATIC_REDIRECTS, JSON.stringify(clientSideRedirects, null, 2), 'utf8')
@@ -13,11 +29,13 @@ export async function syncRestRedirects() {
 
 // Reads in src/rest/lib/rest-api-overrides.json and generates the
 // redirect file src/rest/data/client-side-rest-api-redirects.json
-async function getClientSideRedirects() {
-  const { operationUrls, sectionUrls } = JSON.parse(await readFile(REST_API_OVERRIDES, 'utf8'))
+async function getClientSideRedirects(): Promise<RedirectMap> {
+  const { operationUrls, sectionUrls }: RestApiOverrides = JSON.parse(
+    await readFile(REST_API_OVERRIDES, 'utf8'),
+  )
 
-  const operationRedirects = {}
-  Object.values(operationUrls).forEach((value) => {
+  const operationRedirects: RedirectMap = {}
+  Object.values(operationUrls).forEach((value: OperationUrl) => {
     const oldUrl = value.originalUrl.replace('/rest/reference', '/rest')
     const anchor = oldUrl.split('#')[1]
     const subcategory = value.subcategory
@@ -26,7 +44,7 @@ async function getClientSideRedirects() {
       : `/rest/${value.category}#${anchor}`
     operationRedirects[oldUrl] = redirectTo
   })
-  const redirects = {
+  const redirects: RedirectMap = {
     ...operationRedirects,
     ...sectionUrls,
   }
diff --git a/src/versions/tests/enterprise-versions.js b/src/versions/tests/enterprise-versions.ts
similarity index 100%
rename from src/versions/tests/enterprise-versions.js
rename to src/versions/tests/enterprise-versions.ts