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55
node_modules/babel-plugin-minify-flip-comparisons/README.md
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node_modules/babel-plugin-minify-flip-comparisons/README.md
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# babel-plugin-minify-flip-comparisons
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**Note:** while this plugin doesn’t shorten the output in any way, it does optimize it for repetition-based compression algorithms such as gzip.
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## Example
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**In**
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```javascript
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const foo = a === 1;
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if (bar !== null) {
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var baz = 0;
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}
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```
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**Out**
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```javascript
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const foo = 1 === a;
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if (null !== bar) {
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var baz = 0;
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}
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```
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## Installation
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```sh
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npm install babel-plugin-minify-flip-comparisons
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```
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## Usage
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### Via `.babelrc` (Recommended)
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**.babelrc**
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```json
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{
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"plugins": ["minify-flip-comparisons"]
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}
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```
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### Via CLI
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```sh
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babel --plugins minify-flip-comparisons script.js
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```
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### Via Node API
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```javascript
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require("@babel/core").transform("code", {
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plugins: ["minify-flip-comparisons"]
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});
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```
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node_modules/babel-plugin-minify-flip-comparisons/lib/index.js
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node_modules/babel-plugin-minify-flip-comparisons/lib/index.js
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"use strict";
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module.exports = function ({
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types: t
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}) {
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const isVoid0 = require("babel-helper-is-void-0")(t);
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return {
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name: "minify-flip-comparisons",
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visitor: {
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// flip comparisons with a pure right hand value, this ensures
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// consistency with comparisons and increases the length of
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// strings that gzip can match
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// typeof blah === 'function' -> 'function' === typeof blah
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BinaryExpression(path) {
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const node = path.node;
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const right = node.right,
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left = node.left; // Make sure we have a constant on the right.
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if (!t.isLiteral(right) && !isVoid0(right) && !(t.isUnaryExpression(right) && t.isLiteral(right.argument)) && !t.isObjectExpression(right) && !t.isArrayExpression(right)) {
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return;
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} // Commutative operators.
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if (t.EQUALITY_BINARY_OPERATORS.indexOf(node.operator) >= 0 || ["*", "^", "&", "|"].indexOf(node.operator) >= 0) {
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node.left = right;
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node.right = left;
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return;
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}
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if (t.BOOLEAN_NUMBER_BINARY_OPERATORS.indexOf(node.operator) >= 0) {
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node.left = right;
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node.right = left;
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let operator;
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switch (node.operator) {
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case ">":
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operator = "<";
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break;
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case "<":
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operator = ">";
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break;
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case ">=":
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operator = "<=";
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break;
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case "<=":
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operator = ">=";
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break;
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}
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node.operator = operator;
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return;
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}
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}
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}
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};
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};
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49
node_modules/babel-plugin-minify-flip-comparisons/package.json
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node_modules/babel-plugin-minify-flip-comparisons/package.json
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{
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"_from": "babel-plugin-minify-flip-comparisons@^0.4.1",
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"_id": "babel-plugin-minify-flip-comparisons@0.4.1",
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"_inBundle": false,
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"_integrity": "sha1-5wfl2rxpXJnNKSP+lw7ZrHjE5ws=",
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"_location": "/babel-plugin-minify-flip-comparisons",
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"_phantomChildren": {},
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"_requested": {
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"type": "range",
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"registry": true,
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"raw": "babel-plugin-minify-flip-comparisons@^0.4.1",
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"name": "babel-plugin-minify-flip-comparisons",
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"escapedName": "babel-plugin-minify-flip-comparisons",
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"rawSpec": "^0.4.1",
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"saveSpec": null,
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"fetchSpec": "^0.4.1"
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},
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"_requiredBy": [
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"/babel-preset-minify"
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],
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"_resolved": "https://registry.npmjs.org/babel-plugin-minify-flip-comparisons/-/babel-plugin-minify-flip-comparisons-0.4.1.tgz",
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"_shasum": "e707e5dabc695c99cd2923fe970ed9ac78c4e70b",
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"_spec": "babel-plugin-minify-flip-comparisons@^0.4.1",
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"_where": "/home/s2/Documents/Code/minifyfromhtml/node_modules/babel-preset-minify",
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"author": {
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"name": "amasad"
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},
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"bugs": {
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"url": "https://github.com/babel/minify/issues"
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},
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"bundleDependencies": false,
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"dependencies": {
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"babel-helper-is-void-0": "^0.4.1"
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},
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"deprecated": false,
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"description": "**Note:** while this plugin doesn’t shorten the output in any way, it does optimize it for repetition-based compression algorithms such as gzip.",
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"homepage": "https://github.com/babel/minify#readme",
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"keywords": [
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"babel-plugin"
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],
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"license": "MIT",
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"main": "lib/index.js",
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"name": "babel-plugin-minify-flip-comparisons",
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"repository": {
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"type": "git",
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"url": "https://github.com/babel/minify/tree/master/packages/babel-plugin-minify-flip-comparisons"
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},
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"version": "0.4.1"
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}
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