41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
import { unlink, writeFile } from "node:fs/promises"
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import type { Plugin } from "vite"
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import { transformWithEsbuild } from "vite"
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const prevalPattern = /\.preval\.(js|ts|jsx|tsx|mts|cts)$/
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export function preval(): Plugin {
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return {
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name: "preval",
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enforce: "pre",
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async transform(code, filePath) {
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if (!prevalPattern.test(filePath)) return
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const tempFilePath = `${filePath}.preval.mjs`
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try {
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const transformResult = await transformWithEsbuild(code, filePath, {
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target: "node16",
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format: "esm",
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})
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await writeFile(tempFilePath, transformResult.code)
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const runResult = await import(tempFilePath)
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const serialized = Object.entries(runResult)
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.map(([key, value]) => {
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return key === "default"
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? `export default ${JSON.stringify(value)}`
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: `export const ${key} = ${JSON.stringify(value)}`
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})
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.join("\n")
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return serialized + "\n"
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} finally {
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await unlink(tempFilePath).catch(console.warn)
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}
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},
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}
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}
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