Extracts code from Ember and sets minimum ember-cli-babel

.travis.yml

@@ -12,28 +12,33 @@ addons:
   chrome: stable
 
 cache:
-  directories:
-    - $HOME/.npm
+  yarn: true
 
 env:
-  # we recommend new addons test the current and previous LTS
-  # as well as latest stable release (bonus points to beta/canary)
-  - EMBER_TRY_SCENARIO=ember-lts-2.8
-  - EMBER_TRY_SCENARIO=ember-lts-2.12
-  - EMBER_TRY_SCENARIO=ember-release
-  - EMBER_TRY_SCENARIO=ember-beta
-  - EMBER_TRY_SCENARIO=ember-canary
-  - EMBER_TRY_SCENARIO=ember-default
+  global:
+    # See https://git.io/vdao3 for details.
+    - JOBS=1
+  matrix:
+    # we recommend new addons test the current and previous LTS
+    # as well as latest stable release (bonus points to beta/canary)
+    - EMBER_TRY_SCENARIO=ember-lts-2.8
+    - EMBER_TRY_SCENARIO=ember-lts-2.12
+    - EMBER_TRY_SCENARIO=ember-release
+    - EMBER_TRY_SCENARIO=ember-beta
+    - EMBER_TRY_SCENARIO=ember-canary
+    - EMBER_TRY_SCENARIO=ember-default
 
 matrix:
   fast_finish: true
   allow_failures:
     - env: EMBER_TRY_SCENARIO=ember-canary
 
 before_install:
-  - npm config set spin false
-  - npm install -g npm@4
-  - npm --version
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
+  - export PATH=$HOME/.yarn/bin:$PATH
+
+install:
+  - yarn install --no-lockfile --non-interactive
 
 script:
   # Usually, it's ok to finish the test scenario without reverting

DEPRECATIONS.md

@@ -0,0 +1,43 @@
+# 1.0.0
+
+## `fmt`
+### until: 2.0.0
+### id: ember-string-fmt
+
+This utility was included to ease the transition from the
+internal Ember string package to this addon.
+We suggest that you update your code to use [ES2015 template strings](http://babeljs.io/docs/learn-es2015/#template-strings).
+
+For example, if you have the following `fmt` uses:
+
+```javascript
+import { fmt } from "@ember/string";
+
+let firstName = "John";
+let lastName = "Doe";
+
+fmt("Hello %@ %@", firstName, lastName); // "Hello John Doe"
+fmt("Hello %@2, %@1", firstName, lastName); // "Hello Doe, John"
+```
+
+You can instead use the following template strings:
+
+```javascript
+import { fmt } from "@ember/string";
+
+let firstName = "John";
+let lastName = "Doe";
+
+`Hello ${firstName} ${lastName}` // "Hello John Doe"
+`Hello ${lastName}, ${firstName}` // "Hello Doe, John"
+```
+
+
+## `loc`
+### until: 2.0.0
+### id: ember-string-loc
+
+This utility was included to ease the transition from the
+internal Ember string package to this addon.
+You can consult the [Ember deprecation guide for loc](https://emberjs.com/deprecations/v2.x#toc_code-ember-string-loc-code-and-code-import-loc-from-ember-string-code) for further
+instructions on how to update your code.

README.md

@@ -1,12 +1,12 @@
-# ember-string
+# @ember/string
 
 This README outlines the details of collaborating on this Ember addon.
 
 ## Installation
 
 * `git clone <repository-url>` this repository
-* `cd ember-string`
-* `npm install`
+* `cd @ember/string`
+* `yarn install`
 
 ## Running
 
@@ -15,7 +15,7 @@ This README outlines the details of collaborating on this Ember addon.
 
 ## Running Tests
 
-* `npm test` (Runs `ember try:each` to test your addon against multiple Ember versions)
+* `yarn test` (Runs `ember try:each` to test your addon against multiple Ember versions)
 * `ember test`
 * `ember test --server`
 

addon/cache.js

@@ -0,0 +1,73 @@
+const UNDEFINED = function() {}
+
+export default class Cache {
+  constructor(limit, func, key, store) {
+    this.size   = 0;
+    this.misses = 0;
+    this.hits   = 0;
+    this.limit  = limit;
+    this.func   = func;
+    this.key    = key;
+    this.store  = store || new DefaultStore();
+  }
+
+  get(obj) {
+    let key = this.key === undefined ? obj : this.key(obj);
+    let value = this.store.get(key);
+    if (value === undefined) {
+      this.misses ++;
+      value = this._set(key, this.func(obj));
+    } else if (value === UNDEFINED) {
+      this.hits ++;
+      value = undefined;
+    } else {
+      this.hits ++;
+      // nothing to translate
+    }
+
+    return value;
+  }
+
+  set(obj, value) {
+    let key = this.key === undefined ? obj : this.key(obj);
+    return this._set(key, value);
+  }
+
+  _set(key, value) {
+    if (this.limit > this.size) {
+      this.size ++;
+      if (value === undefined) {
+        this.store.set(key, UNDEFINED);
+      } else {
+        this.store.set(key, value);
+      }
+    }
+
+    return value;
+  }
+
+  purge() {
+    this.store.clear();
+    this.size   = 0;
+    this.hits   = 0;
+    this.misses = 0;
+  }
+}
+
+class DefaultStore {
+  constructor() {
+    this.data = Object.create(null);
+  }
+
+  get(key) {
+    return this.data[key];
+  }
+
+  set(key, value) {
+    this.data[key] = value;
+  }
+
+  clear() {
+    this.data = Object.create(null);
+  }
+}