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I was surprised when I tried to spread a `Set` in TypeScript and the browser complained about `Set.slice()` not being defined. This is because TypeScript does not automatically enable support for iterators when targeting earlier ES versions, like we do in the browser, unless you use the `"downlevelIteration": true` compiler option. This injects some helpers into the necessary files for reading/spreading iterators, which can be stuffed behind an import statement with using the `"importHelpers": true` compiler option and include `tslib` in our dependencies. This is already a dependency of several of our packages, so it shouldn't cause any additional modules.
59 lines
2 KiB
JSON
59 lines
2 KiB
JSON
{
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"compilerOptions": {
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"baseUrl": ".",
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"paths": {
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"ui/*": ["src/ui/public/*"]
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},
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// Support .tsx files and transform JSX into calls to React.createElement
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"jsx": "react",
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// Enables all strict type checking options.
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"strict": true,
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// enables "core language features"
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"lib": [
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// ESNext auto includes previous versions all the way back to es5
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"esnext",
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// includes support for browser APIs
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"dom"
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],
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// Node 8 should support everything output by esnext, we override this
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// in webpack with loader-level compiler options
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"target": "esnext",
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// Use commonjs for node, overridden in webpack to keep import statements
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// to maintain support for things like `await import()`
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"module": "commonjs",
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// Allows default imports from modules with no default export. This does not affect code emit, just type checking.
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// We have to enable this option explicitly since `esModuleInterop` doesn't enable it automatically when ES2015 or
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// ESNext module format is used.
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"allowSyntheticDefaultImports": true,
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// Emits __importStar and __importDefault helpers for runtime babel ecosystem compatibility.
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"esModuleInterop": true,
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// Resolve modules in the same way as Node.js. Aka make `require` works the
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// same in TypeScript as it does in Node.js.
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"moduleResolution": "node",
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// Disallow inconsistently-cased references to the same file.
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"forceConsistentCasingInFileNames": true,
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// Disable the breaking keyof behaviour introduced in TS 2.9.2 until EUI is updated to support that too
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"keyofStringsOnly": true,
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// Provide full support for iterables in for..of, spread and destructuring when targeting ES5 or ES3.
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"downlevelIteration": true,
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// import tslib helpers rather than inlining helpers for iteration or spreading, for instance
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"importHelpers": true
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},
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"include": [
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"src/**/*"
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],
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"exclude": [
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"src/**/__fixtures__/**/*"
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]
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}
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