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import type {
NodePath,
types as BabelTypes,
} from 'next/dist/compiled/babel/core'
import type { PluginObj } from 'next/dist/compiled/babel/core'
// matches any hook-like (the default)
const isHook = /^use[A-Z]/
// matches only built-in hooks provided by React et al
const isBuiltInHook =
/^use(Callback|Context|DebugValue|Effect|ImperativeHandle|LayoutEffect|Memo|Reducer|Ref|State)$/
export default function ({
types: t,
}: {
types: typeof BabelTypes
}): PluginObj<any> {
const visitor = {
CallExpression(path: NodePath<BabelTypes.CallExpression>, state: any) {
const onlyBuiltIns = state.opts.onlyBuiltIns
// if specified, options.lib is a list of libraries that provide hook functions
const libs =
state.opts.lib &&
(state.opts.lib === true
? ['react', 'preact/hooks']
: [].concat(state.opts.lib))
// skip function calls that are not the init of a variable declaration:
if (!t.isVariableDeclarator(path.parent)) return
// skip function calls where the return value is not Array-destructured:
if (!t.isArrayPattern(path.parent.id)) return
// name of the (hook) function being called:
const hookName = (path.node.callee as BabelTypes.Identifier).name
if (libs) {
const binding = path.scope.getBinding(hookName)
// not an import
if (!binding || binding.kind !== 'module') return
const specifier = (binding.path.parent as BabelTypes.ImportDeclaration)
.source.value
// not a match
if (!libs.some((lib: any) => lib === specifier)) return
}
// only match function calls with names that look like a hook
if (!(onlyBuiltIns ? isBuiltInHook : isHook).test(hookName)) return
path.parent.id = t.objectPattern(
path.parent.id.elements.reduce<Array<BabelTypes.ObjectProperty>>(
(patterns, element, i) => {
if (element === null) {
return patterns
}
return patterns.concat(
t.objectProperty(
t.numericLiteral(i),
// TODO: fix this
element as Exclude<
typeof element,
BabelTypes.MemberExpression | BabelTypes.TSParameterProperty
>
)
)
},
[]
)
)
},
}
return {
name: 'optimize-hook-destructuring',
visitor: {
// this is a workaround to run before preset-env destroys destructured assignments
Program(path, state) {
path.traverse(visitor, state)
},
},
}
}
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