fix(wrapDefaultExport): handle complex multiline exports#1624
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SutuSebastian merged 1 commit intomainfrom Sep 8, 2025
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🦋 Changeset detectedLatest commit: 74f92b1 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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WalkthroughRefactors wrapDefaultExport to a unified, config-driven flow handling ESM and CJS, adding robust export-value extraction, last-occurrence targeting, and class/interface skip logic. Adds tests covering complex multiline exports for both module systems. Introduces a changeset entry for a patch release noting the fix. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
actor Dev as Developer
participant WDE as wrapDefaultExport(content, withFunction)
participant CFG as EXPORT_CONFIGS
participant EX as extractExportValue()
participant CR as createWrappedReplacement()
Dev->>WDE: Provide file content + withFunction
WDE->>CFG: Determine module type (esm/cjs) patterns
WDE->>WDE: Find last matching default export
alt No match or default export is class/interface/abstract
WDE-->>Dev: Return original content
else Matched export value
WDE->>EX: Parse export value (handle nested (), {})
EX-->>WDE: exportValue + restContent
WDE->>CR: Build wrapped replacement
CR-->>WDE: prefix + withFunction(exportValue) + restContent
WDE-->>Dev: Return modified content
end
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Actionable comments posted: 2
🧹 Nitpick comments (4)
.changeset/better-kings-fail.md (1)
5-5: Changeset looks goodPatch note is clear and scoped. Consider backticks around the function name for consistency: wrapDefaultExport →
wrapDefaultExport.-fix(wrapDefaultExport): handle complex multiline exports +fix(`wrapDefaultExport`): handle complex multiline exportspackages/ui/src/cli/utils/wrap-default-export.ts (1)
38-47: Optional: make “last occurrence” explicit and fasterDefine a lightweight
prefixRegex(/export\s+default\s+/gor/module\.exports\s*=\s*/g) to avoid the initial greedy(.*$)match. Then iteratematchAlland pick the last index. This reduces work on large files.Example config tweak (adjust main logic accordingly):
const EXPORT_CONFIGS = { esm: { skipPattern: /export\s+default\s+(?:class|interface|abstract\s+class)\s+/, - matchPattern: /(export\s+default\s+)([\s\S]*$)/m, + matchPattern: /(export\s+default\s+)([\s\S]*$)/m, + prefixRegex: /export\s+default\s+/g, }, cjs: { skipPattern: /module\.exports\s*=\s*(?:class|interface|abstract\s+class)\s+/, - matchPattern: /(module\.exports\s*=\s*)([\s\S]*$)/m, + matchPattern: /(module\.exports\s*=\s*)([\s\S]*$)/m, + prefixRegex: /module\.exports\s*=\s*/g, }, };packages/ui/src/cli/utils/wrap-default-export.test.ts (2)
109-151: Great coverage for complex multiline ESM exports; add a newline-after-default caseCurrent parser fails when a newline follows
export default. Add a test to lock this in after fixing the parser.@@ it("handles complex multiline exports with nested function calls and objects", () => { @@ }); + + it("wraps ESM default export when a newline follows `export default`", () => { + const input = ` +export default + withHOC(config, { + enabled: true + }); +`; + const expected = `export default wrapper(withHOC(config, { + enabled: true + }));`; + expect(wrapDefaultExport(input, "wrapper").trim()).toBe(expected.trim()); + });
153-193: CJS multiline test is good; add array and “last assignment wins” cases
- Add an array default export to ensure
[]depth is handled.- Add a case with multiple
module.exports =assignments to verify we wrap the last one.@@ it("handles complex multiline CJS exports with nested function calls and objects", () => { @@ }); + + it("wraps multiline array ESM default export", () => { + const input = `export default [ + 1, + 2 +];`; + const expected = `export default wrapper([ + 1, + 2 +]);`; + expect(wrapDefaultExport(input, "wrapper")).toBe(expected); + }); + + it("wraps only the last CJS assignment", () => { + const input = ` +module.exports = first; +module.exports = second; +`; + const expected = ` +module.exports = wrapper(second); +`; + expect(wrapDefaultExport(input, "wrapper").trim()).toBe(expected.trim()); + });
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📒 Files selected for processing (3)
.changeset/better-kings-fail.md(1 hunks)packages/ui/src/cli/utils/wrap-default-export.test.ts(1 hunks)packages/ui/src/cli/utils/wrap-default-export.ts(1 hunks)
🧰 Additional context used
🧬 Code graph analysis (1)
packages/ui/src/cli/utils/wrap-default-export.test.ts (1)
packages/ui/src/cli/utils/wrap-default-export.ts (1)
wrapDefaultExport(10-36)
Comment on lines
+21
to
33
| // Skip if it's a class/interface export | ||
| if (!content.match(config.skipPattern)) { | ||
| const lastExportMatch = wrappedContent.match(config.matchPattern); | ||
| if (lastExportMatch) { | ||
| const [fullMatch, prefix, rest] = lastExportMatch; | ||
| const { exportValue, restContent } = extractExportValue(rest); | ||
| const replacement = createWrappedReplacement(prefix, exportValue, withFunction, restContent); | ||
|
|
||
| // Replace only the last occurrence | ||
| const index = wrappedContent.lastIndexOf(fullMatch); | ||
| wrappedContent = wrappedContent.slice(0, index) + replacement + wrappedContent.slice(index + fullMatch.length); | ||
| } | ||
| } |
Contributor
There was a problem hiding this comment.
"Last occurrence" logic doesn’t actually target the last export
match(config.matchPattern) captures from the first occurrence to EOF; replacing the “last occurrence” of fullMatch still uses the first prefix. This fails when multiple module.exports = (or rare multiple ESM defaults in generated code) appear; it won’t wrap the last one.
Apply this diff to locate the last prefix and compute rest from that position:
- // Skip if it's a class/interface export
- if (!content.match(config.skipPattern)) {
- const lastExportMatch = wrappedContent.match(config.matchPattern);
- if (lastExportMatch) {
- const [fullMatch, prefix, rest] = lastExportMatch;
- const { exportValue, restContent } = extractExportValue(rest);
- const replacement = createWrappedReplacement(prefix, exportValue, withFunction, restContent);
-
- // Replace only the last occurrence
- const index = wrappedContent.lastIndexOf(fullMatch);
- wrappedContent = wrappedContent.slice(0, index) + replacement + wrappedContent.slice(index + fullMatch.length);
- }
- }
+ // Skip if it's a class/interface export
+ if (!content.match(config.skipPattern)) {
+ const match = wrappedContent.match(config.matchPattern);
+ if (match) {
+ const [, prefix] = match;
+ const index = wrappedContent.lastIndexOf(prefix);
+ if (index !== -1) {
+ const restFromLast = wrappedContent.slice(index + prefix.length);
+ const { exportValue, restContent } = extractExportValue(restFromLast);
+ const replacement = createWrappedReplacement(prefix, exportValue, withFunction, restContent);
+ wrappedContent = wrappedContent.slice(0, index) + replacement;
+ }
+ }
+ }📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
Suggested change
| // Skip if it's a class/interface export | |
| if (!content.match(config.skipPattern)) { | |
| const lastExportMatch = wrappedContent.match(config.matchPattern); | |
| if (lastExportMatch) { | |
| const [fullMatch, prefix, rest] = lastExportMatch; | |
| const { exportValue, restContent } = extractExportValue(rest); | |
| const replacement = createWrappedReplacement(prefix, exportValue, withFunction, restContent); | |
| // Replace only the last occurrence | |
| const index = wrappedContent.lastIndexOf(fullMatch); | |
| wrappedContent = wrappedContent.slice(0, index) + replacement + wrappedContent.slice(index + fullMatch.length); | |
| } | |
| } | |
| // Skip if it's a class/interface export | |
| if (!content.match(config.skipPattern)) { | |
| const match = wrappedContent.match(config.matchPattern); | |
| if (match) { | |
| const [, prefix] = match; | |
| const index = wrappedContent.lastIndexOf(prefix); | |
| if (index !== -1) { | |
| const restFromLast = wrappedContent.slice(index + prefix.length); | |
| const { exportValue, restContent } = extractExportValue(restFromLast); | |
| const replacement = createWrappedReplacement(prefix, exportValue, withFunction, restContent); | |
| wrappedContent = wrappedContent.slice(0, index) + replacement; | |
| } | |
| } | |
| } |
Comment on lines
+52
to
+76
| function extractExportValue(rest: string): { exportValue: string; restContent: string } { | ||
| let depth = 0; | ||
| let i = 0; | ||
|
|
||
| // Parse the export value handling nested parentheses and braces | ||
| for (i = 0; i < rest.length; i++) { | ||
| const char = rest[i]; | ||
| if (char === "(" || char === "{") depth++; | ||
| if (char === ")" || char === "}") depth--; | ||
|
|
||
| // Break on semicolon or newline if we're not inside parentheses/braces | ||
| if (depth === 0 && (char === ";" || char === "\n")) { | ||
| return { | ||
| exportValue: rest.slice(0, char === ";" ? i + 1 : i), | ||
| restContent: rest.slice(char === ";" ? i + 1 : i), | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| return wrappedContent; | ||
| // If we didn't find a terminator, use the whole rest | ||
| return { | ||
| exportValue: rest, | ||
| restContent: "", | ||
| }; | ||
| } |
Contributor
There was a problem hiding this comment.
🛠️ Refactor suggestion
Parser misses arrays and breaks when a newline follows export default
- Arrays ([]) aren’t tracked in
depth, so multiline array exports split early on the first newline. - If there’s a newline immediately after
export default(common in formatted code),exportValuebecomes empty.
Apply this diff to track brackets and skip leading whitespace/newlines:
-function extractExportValue(rest: string): { exportValue: string; restContent: string } {
- let depth = 0;
- let i = 0;
-
- // Parse the export value handling nested parentheses and braces
- for (i = 0; i < rest.length; i++) {
- const char = rest[i];
- if (char === "(" || char === "{") depth++;
- if (char === ")" || char === "}") depth--;
-
- // Break on semicolon or newline if we're not inside parentheses/braces
- if (depth === 0 && (char === ";" || char === "\n")) {
- return {
- exportValue: rest.slice(0, char === ";" ? i + 1 : i),
- restContent: rest.slice(char === ";" ? i + 1 : i),
- };
- }
- }
-
- // If we didn't find a terminator, use the whole rest
- return {
- exportValue: rest,
- restContent: "",
- };
-}
+function extractExportValue(rest: string): { exportValue: string; restContent: string } {
+ let depth = 0;
+ let i = 0;
+
+ // Skip leading whitespace/newlines between the prefix and the expression
+ while (i < rest.length && /\s/.test(rest[i])) i++;
+ const start = i;
+
+ // Parse the export value handling nested (), {}, []
+ for (; i < rest.length; i++) {
+ const char = rest[i];
+ if (char === "(" || char === "{" || char === "[") depth++;
+ else if (char === ")" || char === "}" || char === "]") depth = Math.max(0, depth - 1);
+
+ // Break on semicolon or newline if we're not inside nested structures
+ if (depth === 0 && (char === ";" || char === "\n")) {
+ return {
+ exportValue: rest.slice(start, char === ";" ? i + 1 : i),
+ restContent: rest.slice(char === ";" ? i + 1 : i),
+ };
+ }
+ }
+
+ // If we didn't find a terminator, use the remaining substring
+ return {
+ exportValue: rest.slice(start),
+ restContent: "",
+ };
+}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
Suggested change
| function extractExportValue(rest: string): { exportValue: string; restContent: string } { | |
| let depth = 0; | |
| let i = 0; | |
| // Parse the export value handling nested parentheses and braces | |
| for (i = 0; i < rest.length; i++) { | |
| const char = rest[i]; | |
| if (char === "(" || char === "{") depth++; | |
| if (char === ")" || char === "}") depth--; | |
| // Break on semicolon or newline if we're not inside parentheses/braces | |
| if (depth === 0 && (char === ";" || char === "\n")) { | |
| return { | |
| exportValue: rest.slice(0, char === ";" ? i + 1 : i), | |
| restContent: rest.slice(char === ";" ? i + 1 : i), | |
| }; | |
| } | |
| } | |
| return wrappedContent; | |
| // If we didn't find a terminator, use the whole rest | |
| return { | |
| exportValue: rest, | |
| restContent: "", | |
| }; | |
| } | |
| function extractExportValue(rest: string): { exportValue: string; restContent: string } { | |
| let depth = 0; | |
| let i = 0; | |
| // Skip leading whitespace/newlines between the prefix and the expression | |
| while (i < rest.length && /\s/.test(rest[i])) i++; | |
| const start = i; | |
| // Parse the export value handling nested (), {}, [] | |
| for (; i < rest.length; i++) { | |
| const char = rest[i]; | |
| if (char === "(" || char === "{" || char === "[") depth++; | |
| else if (char === ")" || char === "}" || char === "]") depth = Math.max(0, depth - 1); | |
| // Break on semicolon or newline if we're not inside nested structures | |
| if (depth === 0 && (char === ";" || char === "\n")) { | |
| return { | |
| exportValue: rest.slice(start, char === ";" ? i + 1 : i), | |
| restContent: rest.slice(char === ";" ? i + 1 : i), | |
| }; | |
| } | |
| } | |
| // If we didn't find a terminator, use the remaining substring | |
| return { | |
| exportValue: rest.slice(start), | |
| restContent: "", | |
| }; | |
| } |
🤖 Prompt for AI Agents
In packages/ui/src/cli/utils/wrap-default-export.ts around lines 52 to 76, the
parser doesn't track square brackets and treats an immediate newline after
"export default" as a terminator, producing an empty exportValue; update the
function to skip leading whitespace/newlines before parsing and include "[" and
"]" in the depth tracking logic (increment depth for "(", "{", "[" and decrement
for ")", "}", "]") so multiline arrays and formatted exports are handled
correctly, and only treat semicolon/newline as terminators when depth is zero
after skipping leading whitespace.
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