0.4.2 breaks - passes invalid data to babel-helper-evaluate-path

[swernerx]

Describe the bug

To Reproduce

Minimal code to reproduce the bug

export class Component extends Other {
  constructor() {
    super()
    this.flag = true
  }

  main() {
    alert(this.foo)
  }
}

Actual Output

Nothing!

Expected Output

Output when disabling minify preset:

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Component = void 0;

class Component extends Other {
  constructor() {
    super();
    this.flag = true;
  }

  main() {
    alert(this.foo);
  }

}

exports.Component = Component;

Stack Trace

If applicable,

TypeError: stmts.entries is not a function
    at compareBindingAndReference (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:252:32)
    at evaluateBasedOnControlFlow (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:213:27)
    at evaluateIdentifier (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:119:26)
    at evaluate (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:21:12)
    at PluginPass.Expression (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-plugin-minify-constant-folding/lib/index.js:165:21)
    at PluginPass.newFn (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/visitors.js:286:17)
    at newFn (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/visitors.js:243:21)
    at NodePath._call (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:65:18)
    at NodePath.call (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:40:17)
    at NodePath.visit (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:100:12)

Configuration

How are you using babel-minify?

Directly from the CLI.

babel-minify version: 0.4.2
babel version : 7.0.0-beta.46
babel-minify-config: None

babelrc:

{
 "presets": [
   [ "@babel/env", { "targets": { "node": '6.9.0', "browsers": [] } } ],
   "minify"
  ]
}

[swernerx]

Probably related: Adding preset-react:

.babelrc:

{
  "presets": [
    [ "@babel/env", { "targets": { "node": '6.9.0', "browsers": [] } } ],
    "@babel/react",
    "minify"
  ]
}

Code:

class MyComponent {
}

MyComponent.propTypes = {
  userName: 123
}

Exception:

TypeError: Cannot read property 'isIfStatement' of null
    at evaluateBasedOnControlFlow (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:199:32)
    at evaluateIdentifier (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:119:26)
    at evaluate (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:21:12)
    at PluginPass.Expression (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-plugin-minify-constant-folding/lib/index.js:165:21)
    at PluginPass.newFn (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/visitors.js:286:17)
    at newFn (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/visitors.js:243:21)
    at NodePath._call (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:65:18)
    at NodePath.call (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:40:17)
    at NodePath.visit (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:100:12)
    at TraversalContext.visitQueue (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/context.js:144:16)

[swernerx]

Both issues are new with the release of 0.4.2.

[swernerx]

Using the CLI with the output of preset-env it also fails:

node_modules/.bin/babel-minify error-env.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Component = void 0;

class Component extends Other {
  constructor() {
    super();
    this.flag = true;
  }

  main() {
    alert(this.foo);
  }

}

exports.Component = Component;

Error Message:

TypeError: Cannot read property 'isIfStatement' of null

[swernerx]

Can be reduced further by using this input code:

exports.Component = void 0;

class Component {
}

exports.Component = Component;

This produces the same error when using the CLI.

[swernerx]

When using 0.4.1 for these packages it seems to work:

• babel-minify
• babel-helper-evaluate-path
• babel-plugin-minify-constant-folding

Unfortunately because the patch update it still fails without the last two. NPM still "normalizes" to 0.4.2 in some deeper dependencies.

[boopathi]

Thanks for reporting. I released another patch - 0.4.3 which addresses this issue.

[swernerx]

Unfortunately this does not seem to be the case. Only one of the exceptions is gone. This one is still there:

TypeError: Cannot read property 'isIfStatement' of null

      at evaluateBasedOnControlFlow (node_modules/babel-helper-evaluate-path/lib/index.js:159:32)
      at evaluateIdentifier (node_modules/babel-helper-evaluate-path/lib/index.js:117:26)
      at evaluate (node_modules/babel-helper-evaluate-path/lib/index.js:19:12)
      at PluginPass.Expression (node_modules/babel-plugin-minify-constant-folding/lib/index.js:165:21)
      at PluginPass.newFn (node_modules/@babel/traverse/lib/visitors.js:274:17)
      at newFn (node_modules/@babel/traverse/lib/visitors.js:237:21)
      at NodePath._call (node_modules/@babel/traverse/lib/path/context.js:65:20)
      at NodePath.call (node_modules/@babel/traverse/lib/path/context.js:40:17)
      at NodePath.visit (node_modules/@babel/traverse/lib/path/context.js:100:12)
      at TraversalContext.visitQueue (node_modules/@babel/traverse/lib/context.js:142:16)
      at TraversalContext.visitSingle (node_modules/@babel/traverse/lib/context.js:102:19)
      at TraversalContext.visit (node_modules/@babel/traverse/lib/context.js:182:19)
      at Function.Object.<anonymous>.traverse.node (node_modules/@babel/traverse/lib/index.js:106:17)
      at NodePath.visit (node_modules/@babel/traverse/lib/path/context.js:107:18)
      at TraversalContext.visitQueue (node_modules/@babel/traverse/lib/context.js:142:16)
      at TraversalContext.visitSingle (node_modules/@babel/traverse/lib/context.js:102:19)
      at TraversalContext.visit (node_modules/@babel/traverse/lib/context.js:182:19)
      at Function.Object.<anonymous>.traverse.node (node_modules/@babel/traverse/lib/index.js:106:17)
      at NodePath.visit (node_modules/@babel/traverse/lib/path/context.js:107:18)
      at TraversalContext.visitQueue (node_modules/@babel/traverse/lib/context.js:142:16)
      at TraversalContext.visitSingle (node_modules/@babel/traverse/lib/context.js:102:19)
      at TraversalContext.visit (node_modules/@babel/traverse/lib/context.js:182:19)
      at Function.Object.<anonymous>.traverse.node (node_modules/@babel/traverse/lib/index.js:106:17)
      at NodePath.visit (node_modules/@babel/traverse/lib/path/context.js:107:18)
      at TraversalContext.visitQueue (node_modules/@babel/traverse/lib/context.js:142:16)
      at TraversalContext.visitMultiple (node_modules/@babel/traverse/lib/context.js:97:17)
      at TraversalContext.visit (node_modules/@babel/traverse/lib/context.js:180:19)
      at Function.Object.<anonymous>.traverse.node (node_modules/@babel/traverse/lib/index.js:106:17)
      at NodePath.visit (node_modules/@babel/traverse/lib/path/context.js:107:18)
      at TraversalContext.visitQueue (node_modules/@babel/traverse/lib/context.js:142:16)
      at TraversalContext.visitSingle (node_modules/@babel/traverse/lib/context.js:102:19)
      at TraversalContext.visit (node_modules/@babel/traverse/lib/context.js:182:19)
      at Function.Object.<anonymous>.traverse.node (node_modules/@babel/traverse/lib/index.js:106:17)
      at traverse (node_modules/@babel/traverse/lib/index.js:76:12)
      at transformFile (node_modules/@babel/core/lib/transformation/index.js:116:29)
      at runSync (node_modules/@babel/core/lib/transformation/index.js:45:3)
      at runAsync (node_modules/@babel/core/lib/transformation/index.js:35:14)
      at node_modules/@babel/core/lib/transform-file.js:56:36
      at node_modules/graceful-fs/graceful-fs.js:78:16

Executed on all the new versions. Seems to be related to some different code though. Still investigating...

[swernerx]

Code:

class MyComponent {
}

MyComponent.propTypes = {
}

.babelrc

"presets": [
  "babel-preset-minify",
  "@babel/react",
  "@babel/env"
]

Error:

npx babel z.js
TypeError: Cannot read property 'isIfStatement' of null
    at evaluateBasedOnControlFlow (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:159:32)
    at evaluateIdentifier (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:117:26)
    at evaluate (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-helper-evaluate-path/lib/index.js:19:12)
    at PluginPass.Expression (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/babel-plugin-minify-constant-folding/lib/index.js:165:21)
    at PluginPass.newFn (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/visitors.js:274:17)
    at newFn (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/visitors.js:237:21)
    at NodePath._call (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:65:20)
    at NodePath.call (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:40:17)
    at NodePath.visit (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/path/context.js:100:12)
    at TraversalContext.visitQueue (/Users/swerner/Workspace/sebastian-software/babel-preset-edge/node_modules/@babel/traverse/lib/context.js:142:16)

When disabling "evaluate" it works:

["babel-preset-minify", {"evaluate":false}],

Output:

"use strict";function _classCallCheck(a,b){if(!(a instanceof b))throw new TypeError("Cannot call a class as a function")}var MyComponent=function a(){_classCallCheck(this,a)};MyComponent.propTypes={};

[vigneshshanmugam]

@swernerx Forgot to handle the case for var bindings. Thanks for pointing out. Fixed properly with #848