50 lines
1.4 KiB
TypeScript
50 lines
1.4 KiB
TypeScript
import findUp from 'next/dist/compiled/find-up'
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import fs from 'fs'
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import JSON5 from 'next/dist/compiled/json5'
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type RecursivePartial<T> = {
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[P in keyof T]?: RecursivePartial<T[P]>
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}
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// We'll allow configuration to be typed, but we force everything provided to
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// become optional. We do not perform any schema validation. We should maybe
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// force all the types to be `unknown` as well.
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export async function findConfig<T>(
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directory: string,
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key: string
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): Promise<RecursivePartial<T> | null> {
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// `package.json` configuration always wins. Let's check that first.
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const packageJsonPath = await findUp('package.json', { cwd: directory })
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if (packageJsonPath) {
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const packageJson = require(packageJsonPath)
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if (packageJson[key] != null && typeof packageJson[key] === 'object') {
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return packageJson[key]
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}
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}
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// If we didn't find the configuration in `package.json`, we should look for
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// known filenames.
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const filePath = await findUp(
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[
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`.${key}rc.json`,
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`${key}.config.json`,
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`.${key}rc.js`,
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`${key}.config.js`,
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],
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{
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cwd: directory,
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}
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)
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if (filePath) {
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if (filePath.endsWith('.js')) {
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return require(filePath)
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}
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// We load JSON contents with JSON5 to allow users to comment in their
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// configuration file. This pattern was popularized by TypeScript.
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const fileContents = fs.readFileSync(filePath, 'utf8')
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return JSON5.parse(fileContents)
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}
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return null
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}
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