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add some packages

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s2
2018-05-05 13:54:07 +02:00
parent 48c1138518
commit ff6e20677d
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# babel-plugin-transform-simplify-comparison-operators
Convert `===` and `!==` to `==` and `!=` if their types are inferred to be the same.
## Example
**In**
```javascript
typeof foo === "object";
```
**Out**
```javascript
typeof foo == "object";
```
## Installation
```sh
npm install babel-plugin-transform-simplify-comparison-operators
```
## Usage
### Via `.babelrc` (Recommended)
**.babelrc**
```json
{
"plugins": ["transform-simplify-comparison-operators"]
}
```
### Via CLI
```sh
babel --plugins transform-simplify-comparison-operators script.js
```
### Via Node API
```javascript
require("@babel/core").transform("code", {
plugins: ["transform-simplify-comparison-operators"]
});
```

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"use strict";
module.exports = function ({
types: t
}) {
// custom implementation of getTypeAnnotation that fixes
// the type information that is lost during sequence expression transformation
// https://github.com/babel/minify/issues/323
function customTypeAnnotation(path) {
if (path.typeAnnotation) {
return path.typeAnnotation;
} // We are not handling the case of literals and other base types
// since they are already handled via getTypeAnnotation
const node = path.node;
const binding = path.parentPath.scope.getBinding(node.name);
const types = [];
if (binding && binding.constantViolations) {
if (binding.identifier.typeAnnotation) {
return binding.identifier.typeAnnotation;
}
if (binding.constantViolations) {
const violations = binding.constantViolations;
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (var _iterator = violations[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
let violation = _step.value;
types.push(violation.getTypeAnnotation());
}
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator.return != null) {
_iterator.return();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
}
}
if (types.length > 0) {
return t.createUnionTypeAnnotation(types);
}
return types;
} // Based on the type inference in Babel
function baseTypeStrictlyMatches(left, right) {
let leftTypes, rightTypes;
if (t.isIdentifier(left)) {
leftTypes = customTypeAnnotation(left);
} else if (t.isIdentifier(right)) {
rightTypes = customTypeAnnotation(right);
} // Early exit
if (t.isAnyTypeAnnotation(leftTypes) || t.isAnyTypeAnnotation(rightTypes)) {
return false;
}
leftTypes = [].concat(leftTypes, left.getTypeAnnotation());
rightTypes = [].concat(rightTypes, right.getTypeAnnotation());
leftTypes = t.createUnionTypeAnnotation(leftTypes);
rightTypes = t.createUnionTypeAnnotation(rightTypes);
if (!t.isAnyTypeAnnotation(leftTypes) && t.isFlowBaseAnnotation(leftTypes)) {
return leftTypes.type === rightTypes.type;
}
}
return {
name: "transform-simplify-comparison-operators",
visitor: {
// simplify comparison operations if we're 100% certain
// that each value will always be of the same type
BinaryExpression(path) {
const node = path.node;
const op = node.operator;
if (op !== "===" && op !== "!==") {
return;
}
const left = path.get("left");
const right = path.get("right");
const strictMatch = baseTypeStrictlyMatches(left, right);
if (strictMatch) {
node.operator = node.operator.slice(0, -1);
}
}
}
};
};

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{
"_from": "babel-plugin-transform-simplify-comparison-operators@^6.9.2",
"_id": "babel-plugin-transform-simplify-comparison-operators@6.9.2",
"_inBundle": false,
"_integrity": "sha1-DA6a+nMpJPA6qYL9Y8ktBAi9VlY=",
"_location": "/babel-plugin-transform-simplify-comparison-operators",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "babel-plugin-transform-simplify-comparison-operators@^6.9.2",
"name": "babel-plugin-transform-simplify-comparison-operators",
"escapedName": "babel-plugin-transform-simplify-comparison-operators",
"rawSpec": "^6.9.2",
"saveSpec": null,
"fetchSpec": "^6.9.2"
},
"_requiredBy": [
"/babel-preset-minify"
],
"_resolved": "https://registry.npmjs.org/babel-plugin-transform-simplify-comparison-operators/-/babel-plugin-transform-simplify-comparison-operators-6.9.2.tgz",
"_shasum": "0c0e9afa732924f03aa982fd63c92d0408bd5656",
"_spec": "babel-plugin-transform-simplify-comparison-operators@^6.9.2",
"_where": "/home/s2/Documents/Code/minifyfromhtml/node_modules/babel-preset-minify",
"author": {
"name": "amasad"
},
"bugs": {
"url": "https://github.com/babel/minify/issues"
},
"bundleDependencies": false,
"deprecated": false,
"description": "Convert === and !== to == and != if their types are inferred to be the same.",
"homepage": "https://github.com/babel/minify#readme",
"keywords": [
"babel-plugin"
],
"license": "MIT",
"main": "lib/index.js",
"name": "babel-plugin-transform-simplify-comparison-operators",
"repository": {
"type": "git",
"url": "https://github.com/babel/minify/tree/master/packages/babel-plugin-transform-simplify-comparison-operators"
},
"version": "6.9.2"
}