changes to convert node surrounding code plugin to TS

[SB-gulshans]

Goal

convert plugin nsc js to ts

Design

Changeset

convert plugin nsc js to ts

Testing

unit test cases

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	48.45 kB	14.68 kB
After	48.45 kB	14.68 kB
±	No change	No change

code coverage diff

Ok	File	Lines	Branches	Functions	Statements
✅	/home/runner/work/bugsnag-js/bugsnag-js/packages/plugin-node-surrounding-code/src/surrounding-code.ts	96.82% (+96.82%)	80% (+80%)	95.83% (+95.83%)	94.59% (+94.59%)

Total:

Lines	Branches	Functions	Statements
77.75%(+0.4%)	69.48%(+0.15%)	75.6%(+0.64%)	76.76%(+0.41%)

Generated by 🚫 dangerJS against ad465b5

[Copilot]

Pull request overview

Converts @bugsnag/plugin-node-surrounding-code from JavaScript to TypeScript and updates its packaging/build setup to match the repo’s Rollup-based ESM+CJS distribution pattern.

Changes:

• Added TypeScript build configuration (tsconfig.json) and Rollup config to emit dist/esm + dist/cjs outputs (with declarations).
• Migrated the plugin implementation to src/surrounding-code.ts and updated tests to import the TS source.
• Updated package metadata (type, exports, entrypoints) and added type packages for TS compilation.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/plugin-node-surrounding-code/tsconfig.json	Adds package-level TS config for compiling the plugin source.
packages/plugin-node-surrounding-code/src/surrounding-code.ts	TypeScript port of the surrounding-code plugin implementation.
packages/plugin-node-surrounding-code/test/surrounding-code.test.ts	Updates tests to import TS source and adjusts stream-count expectation.
packages/plugin-node-surrounding-code/rollup.config.mjs	Adds Rollup build config using the repo’s shared Rollup helper.
packages/plugin-node-surrounding-code/package.json	Updates package entrypoints/exports and adds build/typecheck scripts and deps.
package-lock.json	Locks newly added dependencies.

Comments suppressed due to low confidence (2)

packages/plugin-node-surrounding-code/src/surrounding-code.ts:133

• pMapSeries() creates a Promise that never rejects (and never resolves if any inner promise rejects). If any mapped promise rejects, the reduce(...).then(...) chain will reject and the outer Promise will remain pending, which can stall addOnError forever and prevent events from being delivered.
  packages/plugin-node-surrounding-code/src/surrounding-code.ts:94
• The CodeRange field declarations are inconsistently indented (private _start is indented more than the other fields). This is likely to fail formatting/linting and makes the block harder to read.

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