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const {transform} = require("../dist");
// Enum constants taken from the TypeScript codebase.
const ModuleKindCommonJS = 1;
const JsxEmitReactJSX = 4;
const JsxEmitReactJSXDev = 5;
/**
* ts-node transpiler plugin
*
* This plugin hooks into ts-node so that Sucrase can handle all TS-to-JS
* conversion while ts-node handles the ESM loader, require hook, REPL
* integration, etc. ts-node automatically discovers the relevant tsconfig file,
* so the main logic in this integration is translating tsconfig options to the
* corresponding Sucrase options.
*
* Any tsconfig options relevant to Sucrase are translated, but some config
* options outside the scope of Sucrase are ignored. For example, we assume the
* isolatedModules option, and we ignore target because Sucrase doesn't provide
* JS syntax downleveling (at least not in a way that is useful for Node).
*
* One notable caveat is that importsNotUsedAsValues and preserveValueImports
* are ignored right now, since they are deprecated and don't have exact Sucrase
* equivalents. To preserve imports and exports, use verbatimModuleSyntax.
*/
function create(createOptions) {
const {nodeModuleEmitKind} = createOptions;
const {
module,
jsx,
jsxFactory,
jsxFragmentFactory,
jsxImportSource,
esModuleInterop,
verbatimModuleSyntax,
} = createOptions.service.config.options;
return {
transpile(input, transpileOptions) {
const {fileName} = transpileOptions;
const transforms = [];
// Detect JS rather than TS so we bias toward including the typescript
// transform, since almost always it doesn't hurt to include.
const isJS =
fileName.endsWith(".js") ||
fileName.endsWith(".jsx") ||
fileName.endsWith(".mjs") ||
fileName.endsWith(".cjs");
if (!isJS) {
transforms.push("typescript");
}
if (module === ModuleKindCommonJS || nodeModuleEmitKind === "nodecjs") {
transforms.push("imports");
}
if (fileName.endsWith(".tsx") || fileName.endsWith(".jsx")) {
transforms.push("jsx");
}
const {code, sourceMap} = transform(input, {
transforms,
disableESTransforms: true,
jsxRuntime: jsx === JsxEmitReactJSX || jsx === JsxEmitReactJSXDev ? "automatic" : "classic",
production: jsx === JsxEmitReactJSX,
jsxImportSource,
jsxPragma: jsxFactory,
jsxFragmentPragma: jsxFragmentFactory,
keepUnusedImports: verbatimModuleSyntax,
preserveDynamicImport: nodeModuleEmitKind === "nodecjs",
injectCreateRequireForImportRequire: nodeModuleEmitKind === "nodeesm",
enableLegacyTypeScriptModuleInterop: !esModuleInterop,
sourceMapOptions: {compiledFilename: fileName},
filePath: fileName,
});
return {
outputText: code,
sourceMapText: JSON.stringify(sourceMap),
};
},
};
}
exports.create = create;
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