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lb4 openapi generator produces invalid TypeScript code when OpenAPI parameters contain hyphens #11887
Description
Bug Description
When generating server controllers or services using the lb4 openapi generator from an OpenAPI specification containing query or path parameters with hyphens (kebab-case, like limit-number or status-code), the code generator incorrectly emits literal code containing hyphens (e.g., limit-number, status-code) directly inside the TypeScript method body call arguments instead of sanitizing/camelCasing them into valid TypeScript identifiers (limitNumber, statusCode).
This causes immediate compilation/syntax errors.
Steps to Reproduce
Create an OpenAPI 3.0 specification JSON file (openapi.json) with an endpoint having hyphenated query parameters:
{
"openapi": "3.0.3",
"info": {
"title": "Hyphenated Bug API",
"version": "1.0.0"
},
"paths": {
"/customers": {
"get": {
"operationId": "getCustomers",
"parameters": [
{
"name": "limit-number",
"in": "query",
"schema": { "type": "integer" }
},
{
"name": "status-code",
"in": "query",
"schema": { "type": "string" }
}
],
"responses": {
"200": { "description": "OK" }
}
}
}
}
}
- Run the LoopBack OpenAPI generator command pointing to this spec:
lb4 openapi openapi.json - Inspect the generated Controller file.
Current Output (Buggy Code)
The controller method tries to pass raw hyphenated strings as variable names into the service layer call:
async getCustomers(
@param({
name: 'limit-number',
in: 'query',
// ...
}) limitNumber: number | undefined,
@param({
name: 'status-code',
in: 'query',
// ...
}) statusCode: string | undefined
): Promise<any[]> {
// BUG: TypeScript treats 'limit-number' and 'status-code' as invalid mathematical subtraction expressions
return this.openApiService.getCustomers(limit-number, status-code);
}
Expected Output
The generated controller should correctly use the sanitized camelCase parameter identifiers (limitNumber, statusCode) inside the implementation body:
async getCustomers(...): Promise<any[]> {
return this.openApiService.getCustomers(limitNumber, statusCode);
}
Activity
aaqilniz commentedon Nov 8, 2026
Here is a PR #10427 to address this issue.
The fix updates the OpenAPI generator logic to ensure parameter names are properly sanitized into
camelCaseidentifiers (argName) before emitting method body invocation arguments, resolving the invalid TypeScript syntax when handling hyphenated parameters.