compare-i18n-keys

Compare translation keys between legacy Angular translate pipe and new Transloco t() function, then fix the new project.

Arguments

• $ARGUMENTS - Format: --from <source_path> --to <target_path>
  • --from: Source HTML file in old project
  • --to: Target HTML file in new project

Process

Step 1: Extract Keys from Source (Legacy Angular)

Read the source file and extract translation keys using these patterns:

Pattern 1: Basic translate pipe

{{ 'key' | translate }}

Pattern 2: Translate pipe with parameters

{{ 'key' | translate: { param: value } }}

Pattern 3: Translate in attribute

placeholder="{{ 'key' | translate }}"
label="{{ 'key' | translate }}"
matTooltip="{{ 'key' | translate }}"

Step 2: Extract Keys from Target (Transloco)

Read the target file and extract translation keys using these patterns:

Pattern 1: Basic t() function

{{ t('key') }}
t('key')

Pattern 2: t() in attribute binding

[label]="t('key')"
[placeholder]="t('key')"
[matTooltip]="t('key')"

Step 3: Compare and Generate Report

Create a comparison report with:

Category	Description
OK	Key matches exactly
DIFFERENT	Key exists but different (may be intentional)
MISSING	Source key not found in target
EXTRA	Target key not in source (informational)

Step 4: Output Report

# i18n Key Comparison Report

**Source:** {from_path}
**Target:** {to_path}

## Summary

| Category | Count |
|----------|-------|
| Matching Keys | X |
| Different Keys | Y |
| Missing Keys | Z |

**Match Rate: XX%**

## Missing Keys (Need Fix)

| Source Key | Context |
|------------|---------|
| `key.name` | Where it's used |

## Different Keys (Review)

| Source Key | Target Key |
|------------|------------|
| `old.key` | `new.key` |

Step 5: Apply Fixes

If user confirms, fix the target file by replacing incorrect keys with correct ones from source.

Usage

/compare-i18n-keys --from=/path/to/legacy/component.html --to=/path/to/new/component.html