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91 lines
1.1 KiB
Markdown
91 lines
1.1 KiB
Markdown
# babel-plugin-minify-constant-folding
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Tries to evaluate expressions and inline the result.
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## Example
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**In**
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```javascript
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"a" + "b"
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2 * 3;
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4 | 3;
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"b" + a + "c" + "d" + g + z + "f" + "h" + "i"
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[a, b, c].concat([d, e], f, g, [h]);
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["a", "b", "c"].join();
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["a", "b", "c"].join('@');
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[1, 2, 3].length;
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[1, 2, 3][1];
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[1, 2, 3].shift();
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[1, 2, 3].slice(0, 2);
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[a, b, c].pop();
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[a, b, c].reverse();
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"a,b,c".split(",");
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"abc"[0];
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"abc".charAt();
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"abc".charAt(1);
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"abc".length;
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```
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**Out**
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```javascript
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"ab";
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6;
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7;
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"b" + a + "cd" + g + z + "fhi";
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[a, b, c, d, e, f, g, h];
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"a,b,c";
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"a@b@c";
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3;
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2;
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2;
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[1, 2];
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c;
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[c, b, a];
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["a", "b", "c"];
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"a";
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"a";
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"a";
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"b";
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3;
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```
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## Installation
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```sh
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npm install babel-plugin-minify-constant-folding
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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-constant-folding"]
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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-constant-folding 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-constant-folding"]
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});
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```
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## Options
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+ `tdz` - Account for TDZ (Temporal Dead Zone)
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