typescript

The typescript spell wires a TypeScript project's tooling into a magusfile, forking each tool through the project package manager (pnpm exec). Each check is its own op; compose them into your own targets, such as lint over tsc and eslint.

Runtime name: typescript (source spells/typescript/)

Version probe (node): node --version

Version probe (pnpm): pnpm --version

Version probe (tsc): pnpm exec tsc --version

Opaque: yes (its outputs are not enumerable, so magus treats the whole workspace as the cache input).

Passing arguments to ops

Every op is invoked as typescript["<op>"](ctx, opts?). The first argument is the target's context, which is what carries the execution environment; the optional options map shapes the command itself:

Working directory and environment are NOT options: they ride the context, as typescript["<op>"](ctx.withCwd("sub")) and typescript["<op>"](ctx.withEnv({"CGO_ENABLED": "0"})). Only the context reaches the cache key, so an option-table cwd or env would change what the tool did while the key said otherwise; passing either as an option is an error.

Charms (the :charm suffix, e.g. magus run test:rw) are orthogonal: they patch the base argv, while these options add to it. See Charms.

biome-check

biome-check is biome's lint/analyze pass (eslint's role, if your project chose Biome over eslint+prettier - the magusfile decides which composes into lint, not this spell). --write and --reporter=github verified against the current Biome CLI docs (biomejs.dev/reference/cli).

Command: pnpm exec biome check .

gha

Inserts --reporter=github.

[
  {
    "op": "add",
    "path": "/3",
    "value": "--reporter=github"
  }
]

rw

Inserts --write.

[
  {
    "op": "add",
    "path": "/3",
    "value": "--write"
  }
]

Example

// biome-check lints the project through Biome (pnpm exec biome check), the
// spell's alternative to eslint - the magusfile picks one, not both.
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun lint(ctx: magus\Context, args: [str]) > void {
    typescript["biome-check"](ctx);
}

biome-format

biome-format is biome's formatter (prettier's role). Unlike prettier/ruffFormat, biome format has no --check flag to drop: it is read-only by default (reports differences, writes nothing) and --write applies them, so rw ADDS a flag instead of removing one.

Command: pnpm exec biome format .

rw

Inserts --write.

[
  {
    "op": "add",
    "path": "/3",
    "value": "--write"
  }
]

Example

// biome-format checks formatting through Biome (pnpm exec biome format); the
// rw charm (magus run format:rw) applies --write. The spell's alternative to
// prettier - the magusfile picks one, not both.
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun format(ctx: magus\Context, args: [str]) > void {
    typescript["biome-format"](ctx);
}

dev-server

dev-server runs the project's package.json "dev" script via the package manager - framework-neutral (Vite, Next, webpack-dev-server, ...). No readiness probe is declared: the port and startup signal vary by framework, so guessing one would be wrong more often than right (readiness is optional - see services.md). A magusfile that needs to block on readiness for its specific dev server can declare its own service op instead.

Command: pnpm run dev

Example

// dev-server runs the project's package.json dev script (pnpm run dev) as a
// supervised background process when reached via ctx.needs, or foreground
// when run directly.
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun serve(ctx: magus\Context, args: [str]) > void {
    typescript["dev-server"](ctx);
}

eslint

eslint has no built-in "github" formatter (unlike ruff's --output-format=github); "unix" is the built-in, no-extra-devDependency formatter closest to a CI-friendly, one-line-per-problem shape for annotation/regex parsing.

Command: pnpm exec eslint .

gha

Inserts --format=unix.

[
  {
    "op": "add",
    "path": "/2",
    "value": "--format=unix"
  }
]

rw

Inserts --fix.

[
  {
    "op": "add",
    "path": "/2",
    "value": "--fix"
  }
]

Example

// eslint lints the project through the package manager (pnpm exec eslint).
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun lint(ctx: magus\Context, args: [str]) > void {
    typescript["eslint"](ctx);
}

npm-ci

Command: npm ci --prefer-offline

update

Replaces ci with update, drops --prefer-offline.

[
  {
    "op": "replace",
    "path": "/0",
    "value": "update"
  },
  {
    "op": "remove",
    "path": "/1"
  }
]

pnpm-install

Command: pnpm install --frozen-lockfile --prefer-offline

update

Replaces install with update, drops --prefer-offline, drops --frozen-lockfile.

[
  {
    "op": "replace",
    "path": "/0",
    "value": "update"
  },
  {
    "op": "remove",
    "path": "/2"
  },
  {
    "op": "remove",
    "path": "/1"
  }
]

prettier

Command: pnpm exec prettier --check .

rw

Replaces --check with --write.

[
  {
    "op": "replace",
    "path": "/2",
    "value": "--write"
  }
]

Example

// prettier checks formatting; the rw charm (magus run format:rw) rewrites in place.
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun format(ctx: magus\Context, args: [str]) > void {
    typescript["prettier"](ctx);
}

scip

The indexer is a PATH binary (install it with mise, not as a project dep), so it is forked directly. magus injects MAGUS_SYMBOL_INDEX with the cache destination, so the index never lands in the tree; scip-typescript writes there via --output. The runner resolves the bare $MAGUS_SYMBOL_INDEX token against that destination, so no shell is needed to expand it.

Command: scip-typescript index --output $MAGUS_SYMBOL_INDEX

tsc

Command: pnpm exec tsc

Example

// tsc is static analysis, so it composes into the canonical `lint` target
// (alongside eslint) rather than a bespoke `typecheck` target. `magus run lint`
// forks `pnpm exec tsc`.
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun lint(ctx: magus\Context, args: [str]) > void {
    typescript["tsc"](ctx);
}

tsc-build

tsc-build uses TypeScript's project-references incremental build mode (works even without declared references, via its own .tsbuildinfo cache), emitting per tsconfig outDir - see mgs_listProvidedGlobs.

Command: pnpm exec tsc --build

Example

// tsc-build compiles the project via TypeScript's project-references
// incremental build mode (pnpm exec tsc --build).
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun build(ctx: magus\Context, args: [str]) > void {
    typescript["tsc-build"](ctx);
}

tsc-clean

tsc-clean mirrors tsc-build's project-references mode: --clean removes the declared outputs and the incremental .tsbuildinfo cache.

Command: pnpm exec tsc --build --clean

Example

// tsc-clean removes tsc-build's declared outputs and its incremental
// .tsbuildinfo cache (pnpm exec tsc --build --clean).
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun clean(ctx: magus\Context, args: [str]) > void {
    typescript["tsc-clean"](ctx);
}

vitest

Command: pnpm exec vitest run

gha

Appends --reporter=github-actions.

[
  {
    "op": "add",
    "path": "/-",
    "value": "--reporter=github-actions"
  }
]

Example

// vitest runs the test suite; the gha charm annotates failures in GitHub Actions.
import "magus";
import "magus/spell/typescript";

magus\project({ "spells": [typescript] });

export fun test(ctx: magus\Context, args: [str]) > void {
    typescript["vitest"](ctx);
}