comptime.ts/lib/vite.js

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import { createFilter } from "vite";
import MagicString from "magic-string";
import { getComptimeReplacements } from "./comptime.js";
import { readFile } from "node:fs/promises";
export async function comptime(opts) {
    const filter = createFilter(opts?.include, opts?.exclude);
    let resolver;
    let replacements;
    return {
        name: "vite-plugin-comptime",
        async buildStart() {
            resolver = (specifier, importer) => this.resolve(specifier, importer).then(res => res?.id);
            replacements = await getComptimeReplacements({ ...opts, resolver, filter });
        },
        async load(id) {
            const replacement = replacements[id];
            if (!replacement)
                return null;
            const mod = await readFile(id, "utf-8");
            const s = new MagicString(mod);
            for (const r of replacement) {
                s.overwrite(r.start, r.end, r.replacement);
            }
            return { code: s.toString(), map: s.generateMap() };
        },
        async handleHotUpdate({ modules, file }) {
            if (!filter(file))
                return;
            // find new replacements for *only* the affected file
            const newReplacements = await getComptimeReplacements({ ...opts, resolver, filter: id => id === file });
            // TODO: maybe diff the replacements to avoid unnecessary updates
            Object.assign(replacements, newReplacements);
            // fault all modules that depend on the affected file
            return modules;
        },
    };
}
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