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new expression

Demonstrates new with Uint8Array and AudioContext: the same source compiles on every Tish target; only the JavaScript target emits browser-native new.

Features used

None (secure mode).

What it does

  • new Uint8Array(4) — on non-JS targets, a host stub (numeric array of zeros, not a real typed array).
  • new Uint8Array(...[4]) — same stub path with a spread argument list.
  • new AudioContext() — on non-JS targets, a stub context (e.g. sampleRate, no real audio).

For browser-accurate behavior, compile with --target js so the output uses real new Uint8Array / new AudioContext.

Node.js / Bun: validate emitted new

src/node-bun-new-patterns.tish is JS-target only: it exercises constructors that exist as globals in modern Node (18+ for fetch/Headers) and Bun, so you can confirm the transpiler’s new output actually runs.

PatternWhy it matters
new Date(...)Timestamps, logging, TTLs
new Error(...) / TypeErrorErrors without helpers
new Map() / new Set()Caches, deduping, metadata
new URL(abs) / new URL(relative, base)Paths, file://, joining bases (very common in Node tooling)
new ArrayBuffer / new Uint8ArrayBuffers before crypto, streams, fetch bodies
new TextEncoder()String ↔ bytes (encode / decode family)
new RegExp(pattern, flags)When patterns are dynamic
new Uint8Array(...array)Spread in new (ES2018)
new Headers()Undici/fetch stack (Node 18+, Bun)

After tish build … --target js, run node dist/node-bun-new.js or bun dist/node-bun-new.js; each line should end with true.

mkdir -p dist
tish build src/node-bun-new-patterns.tish --target js -o dist/node-bun-new.js
node dist/node-bun-new.js

Use a tish binary built from this repository (e.g. cargo build --release -p tishlang from tish/, then invoke ../../target/release/tish). If which tish points to an older install, JS output can be wrong (for example let epoch = new; instead of new Date(0)).

With npm scripts (from this directory, tish on PATH): npm run verify:js:node or npm run verify:js:bun. After upgrading tish, remove stale output: rm -rf dist.

Other Node/Bun patterns you may add locally (not in the sample file): new Promise(...), new (require("node:events").EventEmitter)(), TextDecoder, DataView, WeakMap, URLSearchParams, Blob — all depend on how much of that surface you want to support in Tish call/member lowering.

Local development

From this directory (Tish repo root is ../..):

# Interpreter
cargo run -p tishlang --manifest-path ../../Cargo.toml --release -- run src/main.tish
 
# Native binary
cargo run -p tishlang --manifest-path ../../Cargo.toml --release -- build src/main.tish -o new-demo
./new-demo
 
# JavaScript (real `new` in output)
cargo run -p tishlang --manifest-path ../../Cargo.toml --release -- build src/main.tish --target js -o new-demo.js

With the tish CLI installed: tish run src/main.tish, tish build src/main.tish -o new-demo, and tish build src/main.tish --target js -o new-demo.js.

Deploy

Same as other examples; see the examples README. This sample is primarily for learning new semantics across targets.

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