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56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
# ES Builder
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This is a library for transpiling TypeScript files.
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It is not a bundler! It builds libraries that export multiple single files, not bundles.
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What does it do?
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- Creates both ES and CommonJS modules in target directory. CommonJS files use '.js' extension, ES files use '.mjs' extension.
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- Creates TypeScript definition files for each file.
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- Rewrites imports paths in ES modules.
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- Updates exports field in package.json
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- Tests ES imports
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Why is it needed?
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- ES modules should have full import paths, including extension, but TypeScript compiler cannot rewrite imports, so it cannot change target extension, so `tsc` cannot be reliably used to create ES modules.
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- Using other tools, such as `esbuild` requires custom plugin. This package is used by multiple packages, so it makes sense to split code into a separate package to make it easily reusable.
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- Currently `tsup` is the only viable alternative, but it is meant to be used as bundler. Without bundle option it currently fails to generate TypeScript definition files.
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- Reusable functions for updating package.json and for testing ES imports.
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## Documentation
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Requirements for using build process:
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- Create `tsconfig.json` that creates CommonJS modules, saves declarations, has `importsNotUsedAsValues` set to `error`.
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- Add script to `package.json` for building source code, such as `"build:source": "tsc -b",`. If you have multipe
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To build packages, create `build.js` in your package:
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```js
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/* eslint-disable */
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const { buildFiles } = require('@iconify/library-builder');
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buildFiles({
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root: __dirname,
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source: './src',
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target: './lib',
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})
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.then(() => {
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console.log('Done');
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})
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.catch((err) => {
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console.error(err);
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process.exit(1);
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});
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```
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Source and target paths must be relative to root directory and start with `./`.
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## License
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The library is released with MIT license.
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© 2021 Vjacheslav Trushkin / Iconify OÜ
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