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Allow literal initializers of readonly properties in declaration files #26313

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merged 4 commits into from Sep 5, 2018
Merged

Allow literal initializers of readonly properties in declaration files #26313

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7623c03
Allow literal initializers of readonly properties in declaration files
weswigham Aug 8, 2018
b0a8702
Merge branch 'master' into fix-declaration-type-widening
weswigham Sep 5, 2018
ec022ac
Merge branch 'master' into fix-declaration-type-widening
weswigham Sep 5, 2018
399d9ae
Move some conditions a bit
weswigham Sep 5, 2018
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44 changes: 23 additions & 21 deletions src/compiler/checker.ts
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Expand Up @@ -21706,7 +21706,7 @@ namespace ts {
const initializer = getEffectiveInitializer(declaration)!;
const type = getTypeOfExpression(initializer, /*cache*/ true);
const widened = getCombinedNodeFlags(declaration) & NodeFlags.Const ||
(getCombinedModifierFlags(declaration) & ModifierFlags.Readonly && !isParameterPropertyDeclaration(declaration)) ||
isDeclarationReadonly(declaration) ||
isTypeAssertion(initializer) ? type : getWidenedLiteralType(type);
if (isInJavaScriptFile(declaration)) {
if (widened.flags & TypeFlags.Nullable) {
Expand Down Expand Up @@ -28080,7 +28080,7 @@ namespace ts {
}

function isLiteralConstDeclaration(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): boolean {
if (isVariableDeclaration(node) && isVarConst(node)) {
if (isDeclarationReadonly(node) || isVariableDeclaration(node) && isVarConst(node)) {
const type = getTypeOfSymbol(getSymbolOfNode(node));
return !!(type.flags & TypeFlags.StringOrNumberLiteral && type.flags & TypeFlags.FreshLiteral);
}
Expand Down Expand Up @@ -29418,26 +29418,28 @@ namespace ts {
(<PrefixUnaryExpression>expr).operand.kind === SyntaxKind.NumericLiteral;
}

function checkAmbientInitializer(node: VariableDeclaration | PropertyDeclaration | PropertySignature) {
if (node.initializer) {
const isInvalidInitializer = !isStringOrNumberLiteralExpression(node.initializer);
const isConstOrReadonly = isDeclarationReadonly(node) || isVariableDeclaration(node) && isVarConst(node);
if (isConstOrReadonly && !node.type) {
if (isInvalidInitializer) {
return grammarErrorOnNode(node.initializer!, Diagnostics.A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal);
}
}
else {
return grammarErrorOnNode(node.initializer!, Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
}
if (!isConstOrReadonly || isInvalidInitializer) {
return grammarErrorOnNode(node.initializer!, Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
}
}
}

function checkGrammarVariableDeclaration(node: VariableDeclaration) {
if (node.parent.parent.kind !== SyntaxKind.ForInStatement && node.parent.parent.kind !== SyntaxKind.ForOfStatement) {
if (node.flags & NodeFlags.Ambient) {
if (node.initializer) {
if (isVarConst(node) && !node.type) {
if (!isStringOrNumberLiteralExpression(node.initializer)) {
return grammarErrorOnNode(node.initializer, Diagnostics.A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal);
}
}
else {
// Error on equals token which immediate precedes the initializer
const equalsTokenLength = "=".length;
return grammarErrorAtPos(node, node.initializer.pos - equalsTokenLength, equalsTokenLength, Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
}
}
if (node.initializer && !(isVarConst(node) && isStringOrNumberLiteralExpression(node.initializer))) {
// Error on equals token which immediate precedes the initializer
const equalsTokenLength = "=".length;
return grammarErrorAtPos(node, node.initializer.pos - equalsTokenLength, equalsTokenLength, Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
}
checkAmbientInitializer(node);
}
else if (!node.initializer) {
if (isBindingPattern(node.name) && !isBindingPattern(node.parent)) {
Expand Down Expand Up @@ -29630,8 +29632,8 @@ namespace ts {
}
}

if (node.flags & NodeFlags.Ambient && node.initializer) {
return grammarErrorOnFirstToken(node.initializer, Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
if (node.flags & NodeFlags.Ambient) {
checkAmbientInitializer(node);
}

if (isPropertyDeclaration(node) && node.exclamationToken && (!isClassLike(node.parent) || !node.type || node.initializer ||
Expand Down
4 changes: 4 additions & 0 deletions src/compiler/utilities.ts
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Expand Up @@ -922,6 +922,10 @@ namespace ts {
return !!(getCombinedModifierFlags(node) & ModifierFlags.Const);
}

export function isDeclarationReadonly(declaration: Declaration): boolean {
return !!(getCombinedModifierFlags(declaration) & ModifierFlags.Readonly && !isParameterPropertyDeclaration(declaration));
}

export function isVarConst(node: VariableDeclaration | VariableDeclarationList): boolean {
return !!(getCombinedNodeFlags(node) & NodeFlags.Const);
}
Expand Down
8 changes: 4 additions & 4 deletions tests/baselines/reference/ambientErrors.errors.txt
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@@ -1,8 +1,8 @@
tests/cases/conformance/ambient/ambientErrors.ts(2,15): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/ambient/ambientErrors.ts(2,17): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/ambient/ambientErrors.ts(17,22): error TS2371: A parameter initializer is only allowed in a function or constructor implementation.
tests/cases/conformance/ambient/ambientErrors.ts(20,24): error TS1183: An implementation cannot be declared in ambient contexts.
tests/cases/conformance/ambient/ambientErrors.ts(29,9): error TS1066: In ambient enum declarations member initializer must be constant expression.
tests/cases/conformance/ambient/ambientErrors.ts(34,11): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/ambient/ambientErrors.ts(34,13): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/ambient/ambientErrors.ts(35,19): error TS1183: An implementation cannot be declared in ambient contexts.
tests/cases/conformance/ambient/ambientErrors.ts(37,20): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/ambient/ambientErrors.ts(38,13): error TS1039: Initializers are not allowed in ambient contexts.
Expand All @@ -17,7 +17,7 @@ tests/cases/conformance/ambient/ambientErrors.ts(57,5): error TS2309: An export
==== tests/cases/conformance/ambient/ambientErrors.ts (14 errors) ====
// Ambient variable with an initializer
declare var x = 4;
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.

// Ambient functions with invalid overloads
Expand Down Expand Up @@ -57,7 +57,7 @@ tests/cases/conformance/ambient/ambientErrors.ts(57,5): error TS2309: An export
// Ambient module with initializers for values, bodies for functions / classes
declare module M1 {
var x = 3;
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.
function fn() { }
~
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/ambientErrors1.errors.txt
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@@ -1,7 +1,7 @@
tests/cases/compiler/ambientErrors1.ts(1,15): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/ambientErrors1.ts(1,17): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/compiler/ambientErrors1.ts (1 errors) ====
declare var x = 4;
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.
4 changes: 2 additions & 2 deletions tests/baselines/reference/ambientStatement1.errors.txt
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@@ -1,5 +1,5 @@
tests/cases/compiler/ambientStatement1.ts(2,6): error TS1036: Statements are not allowed in ambient contexts.
tests/cases/compiler/ambientStatement1.ts(4,20): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/ambientStatement1.ts(4,22): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/compiler/ambientStatement1.ts (2 errors) ====
Expand All @@ -9,6 +9,6 @@ tests/cases/compiler/ambientStatement1.ts(4,20): error TS1039: Initializers are
!!! error TS1036: Statements are not allowed in ambient contexts.

export var v1 = () => false;
~
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How is this readonly declaration?

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It's not, the error span location was just normalized for the initializer forbidden error to always be on the initializer instead of sometimes on the initializer and sometimes on the equals token.

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@weswigham makes sense. Sorry somehow I perceived as error removed. My bad.

~~~~~~~~~~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
}
20 changes: 10 additions & 10 deletions tests/baselines/reference/constDeclarations-ambient-errors.errors.txt
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@@ -1,30 +1,30 @@
tests/cases/compiler/constDeclarations-ambient-errors.ts(2,27): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(3,26): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(2,29): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(3,28): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(4,20): error TS1254: A 'const' initializer in an ambient context must be a string or numeric literal.
tests/cases/compiler/constDeclarations-ambient-errors.ts(4,37): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(4,51): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(8,22): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(4,39): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(4,53): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/constDeclarations-ambient-errors.ts(8,24): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/compiler/constDeclarations-ambient-errors.ts (6 errors) ====
// error: no intialization expected in ambient declarations
declare const c1: boolean = true;
~
~~~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
declare const c2: number = 0;
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.
declare const c3 = null, c4 :string = "", c5: any = 0;
~~~~
!!! error TS1254: A 'const' initializer in an ambient context must be a string or numeric literal.
~
~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.

declare module M {
const c6 = 0;
const c7: number = 7;
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.
}
24 changes: 24 additions & 0 deletions tests/baselines/reference/declarationEmitConstantNoWidening.js
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@@ -0,0 +1,24 @@
//// [declarationEmitConstantNoWidening.ts]
export const FOO = 'FOO';
export class Bar {
readonly type = FOO; // Should be widening literal "FOO" - so either `typeof "FOO"` or = "FOO"
}

//// [declarationEmitConstantNoWidening.js]
"use strict";
exports.__esModule = true;
exports.FOO = 'FOO';
var Bar = /** @class */ (function () {
function Bar() {
this.type = exports.FOO; // Should be widening literal "FOO" - so either `typeof "FOO"` or = "FOO"
}
return Bar;
}());
exports.Bar = Bar;


//// [declarationEmitConstantNoWidening.d.ts]
export declare const FOO = "FOO";
export declare class Bar {
readonly type = "FOO";
}
11 changes: 11 additions & 0 deletions tests/baselines/reference/declarationEmitConstantNoWidening.symbols
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@@ -0,0 +1,11 @@
=== tests/cases/compiler/declarationEmitConstantNoWidening.ts ===
export const FOO = 'FOO';
>FOO : Symbol(FOO, Decl(declarationEmitConstantNoWidening.ts, 0, 12))

export class Bar {
>Bar : Symbol(Bar, Decl(declarationEmitConstantNoWidening.ts, 0, 25))

readonly type = FOO; // Should be widening literal "FOO" - so either `typeof "FOO"` or = "FOO"
>type : Symbol(Bar.type, Decl(declarationEmitConstantNoWidening.ts, 1, 18))
>FOO : Symbol(FOO, Decl(declarationEmitConstantNoWidening.ts, 0, 12))
}
12 changes: 12 additions & 0 deletions tests/baselines/reference/declarationEmitConstantNoWidening.types
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@@ -0,0 +1,12 @@
=== tests/cases/compiler/declarationEmitConstantNoWidening.ts ===
export const FOO = 'FOO';
>FOO : "FOO"
>'FOO' : "FOO"

export class Bar {
>Bar : Bar

readonly type = FOO; // Should be widening literal "FOO" - so either `typeof "FOO"` or = "FOO"
>type : "FOO"
>FOO : "FOO"
}
8 changes: 4 additions & 4 deletions tests/baselines/reference/externSemantics.errors.txt
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@@ -1,13 +1,13 @@
tests/cases/compiler/externSemantics.ts(1,14): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/externSemantics.ts(3,21): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/externSemantics.ts(1,15): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/externSemantics.ts(3,22): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/compiler/externSemantics.ts (2 errors) ====
declare var x=10;
~
~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
declare var v;
declare var y:number=3;
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.

12 changes: 6 additions & 6 deletions tests/baselines/reference/initializersInDeclarations.errors.txt
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@@ -1,10 +1,10 @@
tests/cases/conformance/externalModules/file1.d.ts(4,9): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(5,16): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(6,16): error TS1183: An implementation cannot be declared in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(11,15): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(12,15): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(11,17): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(12,17): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(15,2): error TS1036: Statements are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(17,16): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/externalModules/file1.d.ts(17,18): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/conformance/externalModules/file1.d.ts (7 errors) ====
Expand All @@ -25,10 +25,10 @@ tests/cases/conformance/externalModules/file1.d.ts(17,16): error TS1039: Initial
}

declare var x = [];
~
~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
declare var y = {};
~
~~
!!! error TS1039: Initializers are not allowed in ambient contexts.

declare module M1 {
Expand All @@ -37,6 +37,6 @@ tests/cases/conformance/externalModules/file1.d.ts(17,16): error TS1039: Initial
!!! error TS1036: Statements are not allowed in ambient contexts.

export var v1 = () => false;
~
~~~~~~~~~~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
}
4 changes: 2 additions & 2 deletions tests/baselines/reference/missingRequiredDeclare.d.errors.txt
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@@ -1,10 +1,10 @@
tests/cases/compiler/missingRequiredDeclare.d.ts(1,1): error TS1046: A 'declare' modifier is required for a top level declaration in a .d.ts file.
tests/cases/compiler/missingRequiredDeclare.d.ts(1,7): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/compiler/missingRequiredDeclare.d.ts(1,9): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/compiler/missingRequiredDeclare.d.ts (2 errors) ====
var x = 1;
~~~
!!! error TS1046: A 'declare' modifier is required for a top level declaration in a .d.ts file.
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.
4 changes: 2 additions & 2 deletions tests/baselines/reference/parserModifierOnStatementInBlock2.errors.txt
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@@ -1,13 +1,13 @@
tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserModifierOnStatementInBlock2.ts(2,4): error TS1184: Modifiers cannot appear here.
tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserModifierOnStatementInBlock2.ts(2,18): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserModifierOnStatementInBlock2.ts(2,20): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/conformance/parser/ecmascript5/ErrorRecovery/parserModifierOnStatementInBlock2.ts (2 errors) ====
{
declare var x = this;
~~~~~~~
!!! error TS1184: Modifiers cannot appear here.
~
~~~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
}

4 changes: 2 additions & 2 deletions tests/baselines/reference/parserVariableStatement1.d.errors.txt
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@@ -1,10 +1,10 @@
tests/cases/conformance/parser/ecmascript5/Statements/parserVariableStatement1.d.ts(1,1): error TS1046: A 'declare' modifier is required for a top level declaration in a .d.ts file.
tests/cases/conformance/parser/ecmascript5/Statements/parserVariableStatement1.d.ts(1,7): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/parser/ecmascript5/Statements/parserVariableStatement1.d.ts(1,9): error TS1039: Initializers are not allowed in ambient contexts.


==== tests/cases/conformance/parser/ecmascript5/Statements/parserVariableStatement1.d.ts (2 errors) ====
var v = 1;
~~~
!!! error TS1046: A 'declare' modifier is required for a top level declaration in a .d.ts file.
~
~
!!! error TS1039: Initializers are not allowed in ambient contexts.