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getSpecialPropertyAssignmentKind uses type guards

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Nathan Shively-Sanders
2018-02-07 16:19:49 -08:00
parent d3b02be4a3
commit 4998b99fef
1 changed files with 11 additions and 15 deletions
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26
src/compiler/utilities.ts
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@@ -1550,20 +1550,18 @@ namespace ts {
/// Given a BinaryExpression, returns SpecialPropertyAssignmentKind for the various kinds of property
/// assignments we treat as special in the binder
export function getSpecialPropertyAssignmentKind(expr: BinaryExpression): SpecialPropertyAssignmentKind {
if (!isInJavaScriptFile(expr)) {
if (!isInJavaScriptFile(expr) ||
expr.operatorToken.kind !== SyntaxKind.EqualsToken ||
!isPropertyAccessExpression(expr.left)) {
return SpecialPropertyAssignmentKind.None;
}
if (expr.operatorToken.kind !== SyntaxKind.EqualsToken || expr.left.kind !== SyntaxKind.PropertyAccessExpression) {
return SpecialPropertyAssignmentKind.None;
}
const lhs = <PropertyAccessExpression>expr.left;
if (lhs.expression.kind === SyntaxKind.Identifier) {
const lhsId = <Identifier>lhs.expression;
if (lhsId.escapedText === "exports") {
const lhs = expr.left;
if (isIdentifier(lhs.expression)) {
if (lhs.expression.escapedText === "exports") {
// exports.name = expr
return SpecialPropertyAssignmentKind.ExportsProperty;
}
else if (lhsId.escapedText === "module" && lhs.name.escapedText === "exports") {
else if (lhs.expression.escapedText === "module" && lhs.name.escapedText === "exports") {
// module.exports = expr
return SpecialPropertyAssignmentKind.ModuleExports;
}
@@ -1575,16 +1573,14 @@ namespace ts {
else if (lhs.expression.kind === SyntaxKind.ThisKeyword) {
return SpecialPropertyAssignmentKind.ThisProperty;
}
else if (lhs.expression.kind === SyntaxKind.PropertyAccessExpression) {
else if (isPropertyAccessExpression(lhs.expression)) {
// chained dot, e.g. x.y.z = expr; this var is the 'x.y' part
const innerPropertyAccess = <PropertyAccessExpression>lhs.expression;
if (innerPropertyAccess.expression.kind === SyntaxKind.Identifier) {
if (isIdentifier(lhs.expression.expression)) {
// module.exports.name = expr
const innerPropertyAccessIdentifier = <Identifier>innerPropertyAccess.expression;
if (innerPropertyAccessIdentifier.escapedText === "module" && innerPropertyAccess.name.escapedText === "exports") {
if (lhs.expression.expression.escapedText === "module" && lhs.expression.name.escapedText === "exports") {
return SpecialPropertyAssignmentKind.ExportsProperty;
}
if (innerPropertyAccess.name.escapedText === "prototype") {
if (lhs.expression.name.escapedText === "prototype") {
return SpecialPropertyAssignmentKind.PrototypeProperty;
}
}