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ljqxZhibin Liu
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Zhibin Liu
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Support ES2021 Logical Assignment
1 parent 512cd66 commit 7b6081b

7 files changed

+338
-66
lines changed

‎src/parser.ts

+4-1
Original file line numberDiff line numberDiff line change
@@ -524,7 +524,10 @@ export class Parser {
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op === '>>>=' ||
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op === '&=' ||
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op === '^=' ||
527-
op === '|=';
527+
op === '|=' ||
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op === '&&=' ||
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op === '||=' ||
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op === '??=';
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}
529532

530533
// Cover grammar support.

‎src/scanner.ts

+9-3
Original file line numberDiff line numberDiff line change
@@ -613,7 +613,12 @@ export class Scanner {
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++this.index;
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if (this.source[this.index] === '?') {
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++this.index;
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str = '??';
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if (this.source[this.index] === '=') {
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++this.index;
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str = '??=';
619+
} else {
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str = '??';
621+
}
617622
} if (this.source[this.index] === '.' && !/^\d$/.test(this.source[this.index + 1])) {
618623
// "?." in "foo?.3:0" should not be treated as optional chaining.
619624
// See https://github.com/tc39/proposal-optional-chaining#notes
@@ -642,13 +647,14 @@ export class Scanner {
642647
// 3-character punctuators.
643648
str = str.substr(0, 3);
644649
if (str === '===' || str === '!==' || str === '>>>' ||
645-
str === '<<=' || str === '>>=' || str === '**=') {
650+
str === '<<=' || str === '>>=' || str === '**=' ||
651+
str === '&&=' || str === '||=') {
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this.index += 3;
647653
} else {
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649655
// 2-character punctuators.
650656
str = str.substr(0, 2);
651-
if (str === '&&' || str === '||' || str === '??' ||
657+
if (str === '&&' || str === '||' ||
652658
str === '==' || str === '!=' ||
653659
str === '+=' || str === '-=' || str === '*=' || str === '/=' ||
654660
str === '++' || str === '--' ||

‎test/fixtures/es2021/logical-assignment/logical-and-assignment.js

+1
Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
foo &&= true

‎test/fixtures/es2021/logical-assignment/logical-and-assignment.tree.json

+148
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,148 @@
1+
{
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"type": "Program",
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"body": [
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{
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"type": "ExpressionStatement",
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"expression": {
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"type": "AssignmentExpression",
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"operator": "&&=",
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"left": {
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"type": "Identifier",
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"name": "foo",
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"range": [
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0,
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3
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],
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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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},
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"end": {
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"line": 1,
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"column": 3
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}
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}
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},
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"right": {
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"type": "Literal",
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"value": true,
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"raw": "true",
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"range": [
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8,
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12
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],
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"loc": {
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"start": {
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"line": 1,
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"column": 8
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},
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"end": {
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"line": 1,
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"column": 12
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}
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}
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},
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"range": [
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0,
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12
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],
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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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},
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"end": {
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"line": 1,
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"column": 12
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}
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}
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},
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"range": [
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0,
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12
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],
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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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},
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"end": {
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"line": 1,
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"column": 12
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}
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}
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}
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],
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"sourceType": "script",
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"range": [
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0,
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12
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],
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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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},
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"end": {
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"line": 1,
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"column": 12
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}
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},
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"tokens": [
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{
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"type": "Identifier",
95+
"value": "foo",
96+
"range": [
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0,
98+
3
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],
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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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},
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"end": {
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"line": 1,
107+
"column": 3
108+
}
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}
110+
},
111+
{
112+
"type": "Punctuator",
113+
"value": "&&=",
114+
"range": [
115+
4,
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7
117+
],
118+
"loc": {
119+
"start": {
120+
"line": 1,
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"column": 4
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},
123+
"end": {
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"line": 1,
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"column": 7
126+
}
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}
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},
129+
{
130+
"type": "Boolean",
131+
"value": "true",
132+
"range": [
133+
8,
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12
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],
136+
"loc": {
137+
"start": {
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"line": 1,
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"column": 8
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},
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"end": {
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"line": 1,
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"column": 12
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}
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}
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}
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]
148+
}

‎test/fixtures/es2021/logical-assignment/nullish-coalescing-assignment.js

+1
Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
foo ??= true

‎test/fixtures/es2021/logical-assignment/nullish-coalescing-assignment.tree.json

+148
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,148 @@
1+
{
2+
"type": "Program",
3+
"body": [
4+
{
5+
"type": "ExpressionStatement",
6+
"expression": {
7+
"type": "AssignmentExpression",
8+
"operator": "??=",
9+
"left": {
10+
"type": "Identifier",
11+
"name": "foo",
12+
"range": [
13+
0,
14+
3
15+
],
16+
"loc": {
17+
"start": {
18+
"line": 1,
19+
"column": 0
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},
21+
"end": {
22+
"line": 1,
23+
"column": 3
24+
}
25+
}
26+
},
27+
"right": {
28+
"type": "Literal",
29+
"value": true,
30+
"raw": "true",
31+
"range": [
32+
8,
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12
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],
35+
"loc": {
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"start": {
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"line": 1,
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"column": 8
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},
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"end": {
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"line": 1,
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"column": 12
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}
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}
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},
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"range": [
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0,
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12
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],
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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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},
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"end": {
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"line": 1,
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"column": 12
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}
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}
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},
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"range": [
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0,
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12
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],
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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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},
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"end": {
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"line": 1,
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"column": 12
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}
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}
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}
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],
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"sourceType": "script",
78+
"range": [
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0,
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12
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],
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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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},
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"end": {
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"line": 1,
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"column": 12
90+
}
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},
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"tokens": [
93+
{
94+
"type": "Identifier",
95+
"value": "foo",
96+
"range": [
97+
0,
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3
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],
100+
"loc": {
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"start": {
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"line": 1,
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"column": 0
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},
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"end": {
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"line": 1,
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"column": 3
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}
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}
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},
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{
112+
"type": "Punctuator",
113+
"value": "??=",
114+
"range": [
115+
4,
116+
7
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],
118+
"loc": {
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"start": {
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"line": 1,
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"column": 4
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},
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"end": {
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"line": 1,
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"column": 7
126+
}
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}
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},
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{
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"type": "Boolean",
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"value": "true",
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"range": [
133+
8,
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12
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],
136+
"loc": {
137+
"start": {
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"line": 1,
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"column": 8
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},
141+
"end": {
142+
"line": 1,
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"column": 12
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}
145+
}
146+
}
147+
]
148+
}

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