@backstage/migrate-mui-button-to-bui-button

Migrates MUI 4 Button to Backstage UI Button / ButtonLink.

Covers

• variant="contained" → variant="primary"
• variant="outlined" → variant="secondary" (intentional silent remap; metric outlined-to-secondary)
• variant="text" → variant="tertiary"
• Omitted variant → variant="tertiary" (MUI default is text; BUI default is primary)
• startIcon / endIcon → iconStart / iconEnd
• Simple onClick → onPress
• href present → ButtonLink (same variant mapping)
• Density: omitted / medium / large → size="medium" (BUI default is small; MUI default is medium); small preserved

TODOs / won't-do

• Dynamic / unknown variant or size values left with TODO(backstage-codemod)
• Theme-level Button overrides, classes

Test

bash
Copy
yarn test