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mod.ts
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mod.ts
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import { ensureDir } from "https://deno.land/std@0.136.0/fs/ensure_dir.ts";
import { dirname, join } from "https://deno.land/std@0.136.0/path/mod.ts";
import { VERSION } from "./version.ts";
import init, {
parseDeps as parseDepsWasmFn,
parseExportNames as parseExportNamesWasmFn,
transform as transformWasmFn,
transformCSS as parcelCSS,
} from "./dist/compiler.js";
import decodeWasmData from "./dist/wasm.js";
import {
DependencyDescriptor,
TransformCSSOptions,
TransformCSSResult,
TransformOptions,
TransformResult,
} from "./types.ts";
let wasmReady: Promise<void> | boolean = false;
async function checkWasmReady() {
if (wasmReady === false) {
wasmReady = initWasm();
}
if (wasmReady instanceof Promise) {
await wasmReady;
wasmReady = true;
}
}
/* check whether or not the given path exists as regular file. */
async function existsFile(path: string): Promise<boolean> {
try {
const stat = await Deno.lstat(path);
return stat.isFile;
} catch (err) {
if (err instanceof Deno.errors.NotFound) {
return false;
}
throw err;
}
}
/* initialize the compiler wasm module. */
async function initWasm() {
const mcDir = Deno.env.get("MODULES_CACHE_DIR");
if (mcDir) {
const cacheDir = join(mcDir, `https/deno.land/x/aleph_compiler/dist`);
const cachePath = `${cacheDir}/aleph_compiler.${VERSION}.wasm`;
if (await existsFile(cachePath)) {
const wasmData = await Deno.readFile(cachePath);
await init(wasmData);
} else {
const wasmData = decodeWasmData();
await init(wasmData);
await ensureDir(dirname(cachePath));
await Deno.writeFile(cachePath, wasmData);
}
} else {
const wasmData = decodeWasmData();
await init(wasmData);
}
}
/** Parse export names of the module. */
export async function parseExportNames(
specifier: string,
code: string,
): Promise<string[]> {
await checkWasmReady();
return parseExportNamesWasmFn(specifier, code);
}
/** Parse the deps of the modules. */
export async function parseDeps(
specifier: string,
code: string,
options: Pick<TransformOptions, "importMap" | "lang"> = {},
): Promise<DependencyDescriptor[]> {
await checkWasmReady();
return parseDepsWasmFn(specifier, code, options);
}
/**
* Transforms the JSX/TS module into a JS module.
*
* ```tsx
* transform(
* '/app.tsx',
* `
* import React from 'https://esm.sh/react';
*
* export default App() {
* return <h1>Hello world!</h1>
* }
* `
* )
* ```
*/
export async function transform(
specifier: string,
code: string,
options: TransformOptions = {},
): Promise<TransformResult> {
await checkWasmReady();
return transformWasmFn(specifier, code, options);
}
/**
* Compiles a CSS file, including optionally minifying and lowering syntax to the given
* targets. A source map may also be generated, but this is not enabled by default.
*/
export async function transformCSS(
specifier: string,
code: string,
options: TransformCSSOptions = {},
): Promise<TransformCSSResult> {
await checkWasmReady();
return parcelCSS(specifier, code, options);
}