fix(compiler): error if rawText isn't estimated correctly #60529
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The `TemplateLiteralElementExpr` has some logic where it tries to estimate the `rawText` if one isn't provided by looking at the node's source span. The problem with this approach is that we have some long-standing issues with our expression AST parser (see angular#60267 (comment)) where it might not produce accurate spans if escape sequences are involved. This in turn can lead to unrecoverable errors, because TypeScript will throw an error if the raw string doesn't match the cooked one when constructing a TypeScript AST node. These changes remove the logic that depends on the source span and relies purely on the secondary fallback that inserts escaped characters manually. It's also worth noting that the `rawText` doesn't seem to matter much at this point, because the main usage of it is when downlevelling template literals to ES5 which we no longer support. Fixes angular#60528.
crisbeto
commented
Mar 24, 2025
| } | ||
| export class TemplateLiteralElementExpr extends Expression { | ||
| rawText: string; | ||
| readonly rawText: string; |
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I was also exploring an approach where we just don't track the rawText at all and pass undefined for it. With TypeScript this works fine, but the Babel AST, which we use in the linker, has the opposite requirement where the raw string is required and the cooked one is optional.
JoostK
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Mar 25, 2025
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This PR was merged into the repository by commit 8b990a3. The changes were merged into the following branches: main |
crisbeto
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Apr 5, 2025
) The `TemplateLiteralElementExpr` has some logic where it tries to estimate the `rawText` if one isn't provided by looking at the node's source span. The problem with this approach is that we have some long-standing issues with our expression AST parser (see angular#60267 (comment)) where it might not produce accurate spans if escape sequences are involved. This in turn can lead to unrecoverable errors, because TypeScript will throw an error if the raw string doesn't match the cooked one when constructing a TypeScript AST node. These changes remove the logic that depends on the source span and relies purely on the secondary fallback that inserts escaped characters manually. It's also worth noting that the `rawText` doesn't seem to matter much at this point, because the main usage of it is when downlevelling template literals to ES5 which we no longer support. Fixes angular#60528. PR Close angular#60529
atscott
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Apr 7, 2025
…60753) The `TemplateLiteralElementExpr` has some logic where it tries to estimate the `rawText` if one isn't provided by looking at the node's source span. The problem with this approach is that we have some long-standing issues with our expression AST parser (see #60267 (comment)) where it might not produce accurate spans if escape sequences are involved. This in turn can lead to unrecoverable errors, because TypeScript will throw an error if the raw string doesn't match the cooked one when constructing a TypeScript AST node. These changes remove the logic that depends on the source span and relies purely on the secondary fallback that inserts escaped characters manually. It's also worth noting that the `rawText` doesn't seem to matter much at this point, because the main usage of it is when downlevelling template literals to ES5 which we no longer support. Fixes #60528. PR Close #60529 PR Close #60753
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The
TemplateLiteralElementExprhas some logic where it tries to estimate therawTextif one isn't provided by looking at the node's source span. The problem with this approach is that we have some long-standing issues with our expression AST parser (see #60267 (comment)) where it might not produce accurate spans if escape sequences are involved. This in turn can lead to unrecoverable errors, because TypeScript will throw an error if the raw string doesn't match the cooked one when constructing a TypeScript AST node.These changes remove the logic that depends on the source span and relies purely on the secondary fallback that inserts escaped characters manually.
It's also worth noting that the
rawTextdoesn't seem to matter much at this point, because the main usage of it is when downlevelling template literals to ES5 which we no longer support.Fixes #60528.