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fix: support non-null expressions in more places
Fixes TyrealHu/acorn-typescript#64 Fixes sveltejs/svelte#13409
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lines changed

4 files changed

+341
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‎.changeset/yummy-dogs-dance.md

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@@ -0,0 +1,5 @@
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---
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'@sveltejs/acorn-typescript': patch
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---
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fix: support non-null expressions in more places

‎__test__/__snapshot__/expression/variables.ts

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Original file line numberDiff line numberDiff line change
@@ -5011,6 +5011,331 @@ const VariablesTypeSnapshot = {
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}
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],
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sourceType: 'module'
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},
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NonNullAssignment: {
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type: 'Program',
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start: 0,
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end: 44,
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loc: {
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start: {
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line: 1,
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column: 0,
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index: 0
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},
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end: {
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line: 3,
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column: 7,
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index: 44
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}
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},
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body: [
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{
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type: 'VariableDeclaration',
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start: 0,
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end: 29,
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loc: {
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start: {
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line: 1,
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column: 0,
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index: 0
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},
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end: {
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line: 1,
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column: 29,
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index: 29
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}
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},
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declarations: [
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{
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type: 'VariableDeclarator',
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start: 4,
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end: 29,
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loc: {
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start: {
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line: 1,
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column: 4,
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index: 4
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},
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end: {
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line: 1,
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column: 29,
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index: 29
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}
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},
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id: {
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type: 'Identifier',
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start: 4,
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end: 25,
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loc: {
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start: {
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line: 1,
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column: 4,
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index: 4
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},
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end: {
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line: 1,
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column: 25,
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index: 25
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}
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},
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name: 'a',
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typeAnnotation: {
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type: 'TSTypeAnnotation',
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start: 5,
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end: 25,
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loc: {
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start: {
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line: 1,
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column: 5,
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index: 5
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},
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end: {
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line: 1,
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column: 25,
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index: 25
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}
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},
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typeAnnotation: {
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type: 'TSUnionType',
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start: 7,
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end: 25,
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loc: {
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start: {
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line: 1,
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column: 7,
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index: 7
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},
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end: {
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line: 1,
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column: 25,
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index: 25
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}
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},
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types: [
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{
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type: 'TSNumberKeyword',
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start: 7,
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end: 13,
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loc: {
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start: {
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line: 1,
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column: 7,
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index: 7
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},
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end: {
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line: 1,
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column: 13,
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index: 13
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}
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}
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},
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{
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type: 'TSUndefinedKeyword',
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start: 16,
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end: 25,
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loc: {
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start: {
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line: 1,
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column: 16,
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index: 16
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},
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end: {
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line: 1,
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column: 25,
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index: 25
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}
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}
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}
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]
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}
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}
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},
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init: {
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type: 'Literal',
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start: 28,
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end: 29,
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loc: {
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start: {
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line: 1,
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column: 28,
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index: 28
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},
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end: {
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line: 1,
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column: 29,
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index: 29
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}
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},
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value: 1,
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raw: '1'
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}
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}
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],
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kind: 'let'
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},
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{
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type: 'ExpressionStatement',
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start: 30,
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end: 36,
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loc: {
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start: {
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line: 2,
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column: 0,
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index: 30
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},
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end: {
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line: 2,
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column: 6,
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index: 36
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}
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},
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expression: {
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type: 'AssignmentExpression',
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start: 30,
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end: 36,
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loc: {
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start: {
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line: 2,
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column: 0,
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index: 30
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},
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end: {
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line: 2,
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column: 6,
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index: 36
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}
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},
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operator: '=',
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left: {
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type: 'Identifier',
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start: 30,
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end: 31,
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loc: {
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start: {
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line: 2,
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column: 0,
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index: 30
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},
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end: {
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line: 2,
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column: 1,
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index: 31
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}
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},
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name: 'a'
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},
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right: {
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type: 'Literal',
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start: 35,
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end: 36,
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loc: {
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start: {
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line: 2,
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column: 5,
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index: 35
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},
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end: {
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line: 2,
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column: 6,
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index: 36
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}
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},
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value: 2,
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raw: '2'
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}
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}
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},
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{
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type: 'ExpressionStatement',
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start: 37,
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end: 44,
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loc: {
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start: {
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line: 3,
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column: 0,
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index: 37
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},
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end: {
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line: 3,
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column: 7,
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index: 44
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}
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},
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expression: {
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type: 'AssignmentExpression',
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start: 37,
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end: 44,
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loc: {
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start: {
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line: 3,
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column: 0,
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index: 37
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},
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end: {
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line: 3,
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column: 7,
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index: 44
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}
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},
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operator: '+=',
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left: {
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type: 'TSNonNullExpression',
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start: 37,
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end: 39,
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loc: {
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start: {
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line: 3,
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column: 0,
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index: 37
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},
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end: {
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line: 3,
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column: 2,
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index: 39
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}
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},
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expression: {
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type: 'Identifier',
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start: 37,
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end: 38,
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loc: {
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start: {
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line: 3,
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column: 0,
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index: 37
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},
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end: {
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line: 3,
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column: 1,
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index: 38
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}
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},
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name: 'a'
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}
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},
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right: {
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type: 'Literal',
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start: 43,
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end: 44,
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loc: {
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start: {
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line: 3,
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column: 6,
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index: 43
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},
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end: {
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line: 3,
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column: 7,
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index: 44
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}
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},
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value: 3,
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raw: '3'
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}
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}
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}
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],
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sourceType: 'module'
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}
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};
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‎__test__/expression/variables.test.ts

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@@ -197,4 +197,12 @@ describe('variables declaration', () => {
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equalNode(node, VariablesTypeSnapshot.IssueFile43);
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});
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it('TSNonNullExpression', () => {
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const node = parseSource(
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generateSource([`let a: number | undefined = 1`, `a! = 2`, `a! += 3`])
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);
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equalNode(node, VariablesTypeSnapshot.NonNullAssignment);
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});
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});

‎src/index.ts

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@@ -2592,6 +2592,9 @@ function tsPlugin(options?: {
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}
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checkLValSimple(expr: any, bindingType: any = acornScope.BIND_NONE, checkClashes?: any) {
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if (expr.type === 'TSNonNullExpression') {
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expr = expr.expression;
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}
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return super.checkLValSimple(expr, bindingType, checkClashes);
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}
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