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58 lines
1.2 KiB
58 lines
1.2 KiB
"use strict"; |
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Object.defineProperty(exports, "__esModule", { |
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value: true |
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}); |
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exports.default = hoistVariables; |
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var _t = require("@babel/types"); |
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const { |
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assignmentExpression, |
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expressionStatement, |
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identifier |
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} = _t; |
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const visitor = { |
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Scope(path, state) { |
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if (state.kind === "let") path.skip(); |
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}, |
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FunctionParent(path) { |
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path.skip(); |
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}, |
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VariableDeclaration(path, state) { |
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if (state.kind && path.node.kind !== state.kind) return; |
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const nodes = []; |
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const declarations = path.get("declarations"); |
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let firstId; |
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for (const declar of declarations) { |
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firstId = declar.node.id; |
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if (declar.node.init) { |
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nodes.push(expressionStatement(assignmentExpression("=", declar.node.id, declar.node.init))); |
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} |
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for (const name of Object.keys(declar.getBindingIdentifiers())) { |
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state.emit(identifier(name), name, declar.node.init !== null); |
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} |
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} |
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if (path.parentPath.isFor({ |
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left: path.node |
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})) { |
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path.replaceWith(firstId); |
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} else { |
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path.replaceWithMultiple(nodes); |
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} |
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} |
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}; |
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function hoistVariables(path, emit, kind = "var") { |
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path.traverse(visitor, { |
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kind, |
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emit |
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}); |
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} |