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wip: export { x as default } handling

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This commit is contained in:
Evan You 2020-07-08 17:21:39 -04:00
parent a44d53003e
commit e4df2d7749
1 changed files with 64 additions and 26 deletions
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80
packages/compiler-sfc/src/compileScript.ts
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@ -10,6 +10,7 @@ import {
Identifier,
ExpressionStatement,
ArrowFunctionExpression,
ExportSpecifier,
TSTypeLiteral,
TSFunctionType,
TSDeclareFunction
@ -90,18 +91,38 @@ export function compileScriptSetup(
start + `export default`.length,
`const __default__ =`
)
} else if (
node.type === 'ExportNamedDeclaration' &&
node.specifiers &&
node.specifiers.some(s => s.exported.name === 'default')
) {
} else if (node.type === 'ExportNamedDeclaration' && node.specifiers) {
const defaultSpecifier = node.specifiers.find(
s => s.exported.name === 'default'
) as ExportSpecifier
if (defaultSpecifier) {
defaultExport = node
// 1. remove specifier
if (node.specifiers.length > 1) {
s.remove(
defaultSpecifier.start! + scriptStartOffset!,
defaultSpecifier.end! + scriptStartOffset!
)
} else {
s.remove(
node.start! + scriptStartOffset!,
node.end! + scriptStartOffset!
)
}
if (node.source) {
// export { x as default } from './x'
// TODO
// rewrite to `import { x as __default__ } from './x'` and
// add to top
s.prepend(
`import { ${defaultSpecifier.local.name} as __default__ } from '${
node.source.value
}'\n`
)
} else {
// export { x as default }
// TODO
// rewrite to `const __default__ = x` and move to end
s.append(`\nconst __default__ = ${defaultSpecifier.local.name}\n`)
}
}
}
}
@ -230,22 +251,39 @@ export function compileScriptSetup(
} else if (specifier.type == 'ExportSpecifier') {
if (specifier.exported.name === 'default') {
defaultExport = node
if (!node.source) {
// export { x as default }
// rewrite to `const __default__ = x`
s.overwrite(
start,
end,
`const __default__ = ${specifier.local.name}\n`
// 1. remove specifier
if (node.specifiers.length > 1) {
s.remove(
specifier.start! + startOffset,
specifier.end! + startOffset
)
s.move(start, end, source.length)
} else {
s.remove(node.start! + startOffset!, node.end! + startOffset!)
}
if (!node.source) {
// export { x as default, ... }
const local = specifier.local.name
if (setupScopeVars[local] || setupExports[local]) {
throw new Error(
`Cannot export locally defined variable as default in <script setup>.\n` +
`Default export must be an object literal with no reference to local scope.\n` +
generateCodeFrame(
source,
specifier.start! + startOffset,
specifier.end! + startOffset
)
)
}
// rewrite to `const __default__ = x` and move to end
s.append(`\nconst __default__ = ${local}\n`)
} else {
// export { x as default } from './x'
// rewrite to `import { x as __default__ } from './x'`
s.overwrite(
specifier.exported.start! + startOffset,
specifier.exported.start! + startOffset + 7,
'__default__'
// rewrite to `import { x as __default__ } from './x'` and
// add to top
s.prepend(
`import { ${specifier.local.name} as __default__ } from '${
node.source.value
}'\n`
)
}
} else {
@ -261,7 +299,7 @@ export function compileScriptSetup(
s.overwrite(
start,
node.source.start! + startOffset,
`import * as __import_all_${exportAllIndex++}__ from `
`import * as __export_all_${exportAllIndex++}__ from `
)
s.move(start, end, 0)
}