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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | 1x 35x 35x 35x 35x 35x 35x 35x 4x 31x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x 35x | import type { AwaitExpression } from '@babel/types' import type { ScriptCompileContext } from './context' /** * Support context-persistence between top-level await expressions: * * ```js * const instance = getCurrentInstance() * await foo() * expect(getCurrentInstance()).toBe(instance) * ``` * * In the future we can potentially get rid of this when Async Context * becomes generally available: https://github.com/tc39/proposal-async-context * * ```js * // input * await foo() * // output * ;( * ([__temp,__restore] = withAsyncContext(() => foo())), * await __temp, * __restore() * ) * * // input * const a = await foo() * // output * const a = ( * ([__temp, __restore] = withAsyncContext(() => foo())), * __temp = await __temp, * __restore(), * __temp * ) * ``` */ export function processAwait( ctx: ScriptCompileContext, node: AwaitExpression, needSemi: boolean, isStatement: boolean, ): void { const argumentStart = node.argument.extra && node.argument.extra.parenthesized ? (node.argument.extra.parenStart as number) : node.argument.start! const startOffset = ctx.startOffset! const argumentStr = ctx.descriptor.source.slice( argumentStart + startOffset, node.argument.end! + startOffset, ) const containsNestedAwait = /\bawait\b/.test(argumentStr) ctx.s.overwrite( node.start! + startOffset, argumentStart + startOffset, `${needSemi ? `;` : ``}(\n ([__temp,__restore] = ${ctx.helper( `withAsyncContext`, )}(${containsNestedAwait ? `async ` : ``}() => `, ) ctx.s.appendLeft( node.end! + startOffset, `)),\n ${isStatement ? `` : `__temp = `}await __temp,\n __restore()${ isStatement ? `` : `,\n __temp` }\n)`, ) } |