JoBoEVD/UglifyJS
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

improve parse errors for destructuring spread elements

Browse Source
This commit is contained in:
kzc 2017-08-01 23:39:04 -04:00
parent 6f52e39ad3
commit 38e33407df
2 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/parse.js
View File

@ -1522,7 +1522,7 @@ function parse($TEXT, options) {
}
if (is_expand) {
if (!is("punc", "]")) {
unexpected(); // Must be last element
token_error(S.token, "Rest element must be last element");
}
elements[elements.length - 1] = new AST_Expansion({
start: expand_token,
@ -1606,7 +1606,7 @@ function parse($TEXT, options) {
}
if (is_expand) {
if (!is("punc", "}")) {
unexpected(); // Must be last element
token_error(S.token, "Rest element must be last element");
}
}
else if (is("operator", "=")) {

10
test/mocha/lhs-expressions.js
View File

@ -253,13 +253,19 @@ describe("Left-hand side expressions", function () {
// Multiple spreads are not allowed in destructuring array
expect("[...a, ...b] = [1, 2, 3, 4]", "Spread must the be last element in destructuring array");
// Array spread must be last in destructuring declaration
expect("let [ ...x, a ] = o;", "Rest element must be last element");
// Only one spread per destructuring array declaration
expect("let [ a, ...x, ...y ] = o;", "Rest element must be last element");
// Spread in block should not be allowed
expect("{...a} = foo", "Unexpected token: expand (...)");
// Object spread must be last in destructuring declaration
expect("let { ...x, a } = o;", "Unexpected token: punc (,)");
expect("let { ...x, a } = o;", "Rest element must be last element");
// Only one spread per destructuring declaration
expect("let { a, ...x, ...y } = o;", "Unexpected token: punc (,)");
expect("let { a, ...x, ...y } = o;", "Rest element must be last element");
});
});