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Infer function expressions in matching contexts (#514)

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* legalizes omitting types on function expressions within function type contexts
* legalizes omitting any number of arguments
This commit is contained in:
Daniel Wirtz
2019-02-27 21:45:36 +01:00
committed by GitHub
parent 2945af6557
commit e8b0767143
29 changed files with 1349 additions and 701 deletions
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32
src/ast.ts
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@ -864,6 +864,7 @@ export abstract class Node {
body: Statement | null,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
arrowKind: ArrowKind,
range: Range
): FunctionDeclaration {
var stmt = new FunctionDeclaration();
@ -874,6 +875,7 @@ export abstract class Node {
stmt.signature = signature;
stmt.body = body;
stmt.decorators = decorators;
stmt.arrowKind = arrowKind;
return stmt;
}
@ -1773,6 +1775,16 @@ export class ForStatement extends Statement {
statement: Statement;
}
/** Indicates the kind of an array function. */
export const enum ArrowKind {
/** Not an arrow function. */
NONE,
/** Parenthesized parameter list. */
ARROW_PARENTHESIZED,
/** Single parameter without parenthesis. */
ARROW_SINGLE
}
/** Represents a `function` declaration. */
export class FunctionDeclaration extends DeclarationStatement {
kind = NodeKind.FUNCTIONDECLARATION;
@ -1783,6 +1795,8 @@ export class FunctionDeclaration extends DeclarationStatement {
signature: SignatureNode;
/** Body statement. Usually a block. */
body: Statement | null;
/** Arrow function kind, if applicable. */
arrowKind: ArrowKind;
get isGeneric(): bool {
var typeParameters = this.typeParameters;
@ -1792,7 +1806,14 @@ export class FunctionDeclaration extends DeclarationStatement {
/** Clones this function declaration. */
clone(): FunctionDeclaration {
return Node.createFunctionDeclaration(
this.name, this.typeParameters, this.signature, this.body, this.decorators, this.flags, this.range
this.name,
this.typeParameters,
this.signature,
this.body,
this.decorators,
this.flags,
this.arrowKind,
this.range
);
}
}
@ -1960,3 +1981,12 @@ export function mangleInternalPath(path: string): string {
if (path.endsWith(".ts")) path = path.substring(0, path.length - 3);
return path;
}
/** Tests if the specified type node represents an omitted type. */
export function isTypeOmitted(type: CommonTypeNode): bool {
if (type.kind == NodeKind.TYPE) {
let name = (<TypeNode>type).name;
return !(name.next || name.identifier.text.length);
}
return false;
}