next/dist/build/babel/plugins/optimize-hook-destructuring.js

The React Framework

"use strict";exports.__esModule=true;exports.default=_default;// 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)$/;function _default({types:t}){const visitor={CallExpression(path,state){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.name;if(libs){const binding=path.scope.getBinding(hookName);// not an import
if(!binding||binding.kind!=='module')return;const specifier=binding.path.parent.source.value;// not a match
if(!libs.some(lib=>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((patterns,element,i)=>{if(element===null){return patterns;}return patterns.concat(t.objectProperty(t.numericLiteral(i),element));},[]));}};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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