pref: load js and wasm in parallel

src/nostalgist.ts

@@ -494,21 +494,37 @@ export class Nostalgist {
 
  private async getCoreOption() {
  const { core, resolveCoreJs, resolveCoreWasm } = this.options
- const coreDict =
- typeof core === 'string'
- ? { name: core, js: await resolveCoreJs(core, this.options), wasm: await resolveCoreWasm(core, this.options) }
- : core
-
+ let coreDict
+ if (typeof core === 'string') {
+ const [js, wasm] = await Promise.all([resolveCoreJs(core, this.options), resolveCoreWasm(core, this.options)])
+ coreDict = { name: core, js, wasm }
+ } else {
+ coreDict = core
+ }
  let { name, js, wasm } = coreDict
+
+ const promises = []
  if (typeof js === 'string') {
- const response = await fetch(js)
- js = await response.text()
+ promises.push(
+ (async () => {
+ const response = await fetch(js)
+ js = await response.text()
+ })(),
+ )
  }
  if (typeof wasm === 'string') {
- const response = await fetch(wasm)
- wasm = await response.arrayBuffer()
+ promises.push(
+ (async () => {
+ const response = await fetch(wasm as string)
+ wasm = await response.arrayBuffer()
+ })(),
+ )
+ }
+ if (promises.length > 0) {
+ await Promise.all(promises)
  }
- return { name, js, wasm }
+
+ return { name, js, wasm: wasm as ArrayBuffer }
  }
 
  private async resolveFile(file: NostalgistOptionsFile, resolveFunction: NostalgistResolveFileFunction) {