x/wasm@v1.0.2/lib.ts

Monorepo for Javascript WebAssembly packages by Wasmer
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// import load, { WASI } from "./pkg/index";export * from "./pkg/wasmer_wasi_js";import { InitInput } from "./pkg/wasmer_wasi_js";import load from "./pkg/wasmer_wasi_js";import wasm_bytes from "./pkg/wasmer_wasi_js_bg.wasm";
interface MimeBuffer extends Buffer { type: string; typeFull: string; charset: string;}
/** * Returns a `Buffer` instance from the given data URI `uri`. * * @param {String} uri Data URI to turn into a Buffer instance * @returns {Buffer} Buffer instance from Data URI * @api public */function dataUriToBuffer(uri: string): MimeBuffer { if (!/^data:/i.test(uri)) { throw new TypeError( '`uri` does not appear to be a Data URI (must begin with "data:")' ); }
// strip newlines uri = uri.replace(/\r?\n/g, '');
// split the URI up into the "metadata" and the "data" portions const firstComma = uri.indexOf(','); if (firstComma === -1 || firstComma <= 4) { throw new TypeError('malformed data: URI'); }
// remove the "data:" scheme and parse the metadata const meta = uri.substring(5, firstComma).split(';');
let charset = ''; let base64 = false; const type = meta[0] || 'text/plain'; let typeFull = type; for (let i = 1; i < meta.length; i++) { if (meta[i] === 'base64') { base64 = true; } else { typeFull += `;${ meta[i]}`; if (meta[i].indexOf('charset=') === 0) { charset = meta[i].substring(8); } } } // defaults to US-ASCII only if type is not provided if (!meta[0] && !charset.length) { typeFull += ';charset=US-ASCII'; charset = 'US-ASCII'; }
// get the encoded data portion and decode URI-encoded chars const encoding = base64 ? 'base64' : 'ascii'; const data = unescape(uri.substring(firstComma + 1)); const buffer = Buffer.from(data, encoding) as MimeBuffer;
// set `.type` and `.typeFull` properties to MIME type buffer.type = type; buffer.typeFull = typeFull;
// set the `.charset` property buffer.charset = charset;
return buffer;}
let inited: Promise<any> | null = null;export const init = async (input?: InitInput | Promise<InitInput>, force?: boolean) => { if (inited === null || force === true) { if (!input) { input = await WebAssembly.compile(dataUriToBuffer(wasm_bytes as any as string)); } inited = load(input); } await inited;}