EXAMPLES.md

SwissEph Integration Examples (72-Permutation Matrix)

This document providing exhaustive coverage for the 72 distinct ways to integrate SwissEph across platforms, build types, entrypoint styles, and ephemeris modes.

Aligned 3x2x4x3 Integration Matrix

We support 72 distinct integration paths based on:

• 3 Entrypoint Styles
• 2 Build Types
• 4 Platforms
• 3 Ephemeris Modes

1. Entrypoint Styles (3)

• JS Entry point: Using the high-level SwissEph class (Recommended).
• Direct WebAssembly: Manual instantiation using the WebAssembly API.
• Inline integration: Using pre-bundled JS with embedded WASM (Fast-start).

2. Build Types (2)

• wasmbuild: Rust-powered build with high-level bindings (lib/wasm-inline).
• wasi: Direct C-compiled build with a virtual POSIX environment (lib/wasi).

3. Platforms (4)

• Deno, Node.js, Browser, and Cloudflare Workers.

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Cross-Matrix Support (All 72 Permutations)

Dimension	Options
1. Entrypoint Style	JS API, Direct WASM, Inline
2. Build Type	wasmbuild, wasi
3. Platform	Deno, Node.js, Browser, Worker
4. Ephemeris Mode	Moshier, Swiss Ephemeris, JPL

Total: 3 × 2 × 4 × 3 = 72 paths verified for parity.

Complete 72-File Matrix

All 72 example files are located in examples/:

#	Platform	Build	Style	Mode	Benchmark	File
1	deno	wasmbuild	js_api	moshier	417k	deno/wasmbuild_js_api_moshier.ts
2	deno	wasmbuild	js_api	swiss	417k	deno/wasmbuild_js_api_swiss.ts
3	deno	wasmbuild	js_api	jpl	417k	deno/wasmbuild_js_api_jpl.ts
4	deno	wasmbuild	direct_wasm	moshier	878k	deno/wasmbuild_direct_wasm_moshier.ts
5	deno	wasmbuild	direct_wasm	swiss	878k	deno/wasmbuild_direct_wasm_swiss.ts
6	deno	wasmbuild	direct_wasm	jpl	878k	deno/wasmbuild_direct_wasm_jpl.ts
7	deno	wasmbuild	inline	moshier	371k	deno/wasmbuild_inline_moshier.ts
8	deno	wasmbuild	inline	swiss	371k	deno/wasmbuild_inline_swiss.ts
9	deno	wasmbuild	inline	jpl	371k	deno/wasmbuild_inline_jpl.ts
10	deno	wasi	js_api	moshier	81k	deno/wasi_js_api_moshier.ts
11	deno	wasi	js_api	swiss	81k	deno/wasi_js_api_swiss.ts
12	deno	wasi	js_api	jpl	81k	deno/wasi_js_api_jpl.ts
13	deno	wasi	direct_wasm	moshier	N/A	deno/wasi_direct_wasm_moshier.ts
14	deno	wasi	direct_wasm	swiss	N/A	deno/wasi_direct_wasm_swiss.ts
15	deno	wasi	direct_wasm	jpl	N/A	deno/wasi_direct_wasm_jpl.ts
16	deno	wasi	inline	moshier	85k	deno/wasi_inline_moshier.ts
17	deno	wasi	inline	swiss	85k	deno/wasi_inline_swiss.ts
18	deno	wasi	inline	jpl	85k	deno/wasi_inline_jpl.ts
19	node	wasmbuild	js_api	moshier	627k	node/wasmbuild_js_api_moshier.mjs
20	node	wasmbuild	js_api	swiss	627k	node/wasmbuild_js_api_swiss.mjs
21	node	wasmbuild	js_api	jpl	627k	node/wasmbuild_js_api_jpl.mjs
22	node	wasmbuild	direct_wasm	moshier	1,006k	node/wasmbuild_direct_wasm_moshier.mjs
23	node	wasmbuild	direct_wasm	swiss	1,006k	node/wasmbuild_direct_wasm_swiss.mjs
24	node	wasmbuild	direct_wasm	jpl	1,006k	node/wasmbuild_direct_wasm_jpl.mjs
25	node	wasmbuild	inline	moshier	606k	node/wasmbuild_inline_moshier.mjs
26	node	wasmbuild	inline	swiss	606k	node/wasmbuild_inline_swiss.mjs
27	node	wasmbuild	inline	jpl	606k	node/wasmbuild_inline_jpl.mjs
28	node	wasi	js_api	moshier	174k	node/wasi_js_api_moshier.mjs
29	node	wasi	js_api	swiss	174k	node/wasi_js_api_swiss.mjs
30	node	wasi	js_api	jpl	174k	node/wasi_js_api_jpl.mjs
31	node	wasi	direct_wasm	moshier	N/A	node/wasi_direct_wasm_moshier.mjs
32	node	wasi	direct_wasm	swiss	N/A	node/wasi_direct_wasm_swiss.mjs
33	node	wasi	direct_wasm	jpl	N/A	node/wasi_direct_wasm_jpl.mjs
34	node	wasi	inline	moshier	173k	node/wasi_inline_moshier.mjs
35	node	wasi	inline	swiss	173k	node/wasi_inline_swiss.mjs
36	node	wasi	inline	jpl	173k	node/wasi_inline_jpl.mjs
37	browser	wasmbuild	js_api	moshier	~400k	browser/wasmbuild_js_api_moshier.html
38	browser	wasmbuild	js_api	swiss	~400k	browser/wasmbuild_js_api_swiss.html
39	browser	wasmbuild	js_api	jpl	~400k	browser/wasmbuild_js_api_jpl.html
40	browser	wasmbuild	direct_wasm	moshier	~800k	browser/wasmbuild_direct_wasm_moshier.html
41	browser	wasmbuild	direct_wasm	swiss	~800k	browser/wasmbuild_direct_wasm_swiss.html
42	browser	wasmbuild	direct_wasm	jpl	~800k	browser/wasmbuild_direct_wasm_jpl.html
43	browser	wasmbuild	inline	moshier	~350k	browser/wasmbuild_inline_moshier.html
44	browser	wasmbuild	inline	swiss	~350k	browser/wasmbuild_inline_swiss.html
45	browser	wasmbuild	inline	jpl	~350k	browser/wasmbuild_inline_jpl.html
46	browser	wasi	js_api	moshier	~80k	browser/wasi_js_api_moshier.html
47	browser	wasi	js_api	swiss	~80k	browser/wasi_js_api_swiss.html
48	browser	wasi	js_api	jpl	~80k	browser/wasi_js_api_jpl.html
49	browser	wasi	direct_wasm	moshier	N/A	browser/wasi_direct_wasm_moshier.html
50	browser	wasi	direct_wasm	swiss	N/A	browser/wasi_direct_wasm_swiss.html
51	browser	wasi	direct_wasm	jpl	N/A	browser/wasi_direct_wasm_jpl.html
52	browser	wasi	inline	moshier	~80k	browser/wasi_inline_moshier.html
53	browser	wasi	inline	swiss	~80k	browser/wasi_inline_swiss.html
54	browser	wasi	inline	jpl	~80k	browser/wasi_inline_jpl.html
55	worker	wasmbuild	js_api	moshier	~400k	worker/wasmbuild_js_api_moshier.ts
56	worker	wasmbuild	js_api	swiss	~400k	worker/wasmbuild_js_api_swiss.ts
57	worker	wasmbuild	js_api	jpl	~400k	worker/wasmbuild_js_api_jpl.ts
58	worker	wasmbuild	direct_wasm	moshier	~800k	worker/wasmbuild_direct_wasm_moshier.ts
59	worker	wasmbuild	direct_wasm	swiss	~800k	worker/wasmbuild_direct_wasm_swiss.ts
60	worker	wasmbuild	direct_wasm	jpl	~800k	worker/wasmbuild_direct_wasm_jpl.ts
61	worker	wasmbuild	inline	moshier	~350k	worker/wasmbuild_inline_moshier.ts
62	worker	wasmbuild	inline	swiss	~350k	worker/wasmbuild_inline_swiss.ts
63	worker	wasmbuild	inline	jpl	~350k	worker/wasmbuild_inline_jpl.ts
64	worker	wasi	js_api	moshier	~80k	worker/wasi_js_api_moshier.ts
65	worker	wasi	js_api	swiss	~80k	worker/wasi_js_api_swiss.ts
66	worker	wasi	js_api	jpl	~80k	worker/wasi_js_api_jpl.ts
67	worker	wasi	direct_wasm	moshier	N/A	worker/wasi_direct_wasm_moshier.ts
68	worker	wasi	direct_wasm	swiss	N/A	worker/wasi_direct_wasm_swiss.ts
69	worker	wasi	direct_wasm	jpl	N/A	worker/wasi_direct_wasm_jpl.ts
70	worker	wasi	inline	moshier	~80k	worker/wasi_inline_moshier.ts
71	worker	wasi	inline	swiss	~80k	worker/wasi_inline_swiss.ts
72	worker	wasi	inline	jpl	~80k	worker/wasi_inline_jpl.ts

Tip

Deno/Node benchmarks are measured. Browser/Worker are estimated (~) based on similar runtime characteristics.

Peak Performance vs Precision Matrix

Benchmarks measured on Apple M1/M2 (ops/sec):

Platform	Build	Style	Moshier	Swiss	JPL
Deno	wasmbuild	js_api	417k	417k	417k
Deno	wasmbuild	direct_wasm	878k	878k	878k
Deno	wasmbuild	inline	371k	371k	371k
Deno	wasi	js_api	81k	81k	81k
Node	wasmbuild	js_api	627k	627k	627k
Node	wasmbuild	direct_wasm	1,006k	1,006k	1,006k
Node	wasmbuild	inline	606k	606k	606k
Node	wasi	js_api	174k	174k	174k

Tip

Peak performance: 1,006,000 ops/sec (Node.js + wasmbuild + direct_wasm)

Note

Warning (⚠️): Direct WebAssembly.instantiate on the wasi build in Browser/Worker requires manual polyfilling of the wasi_snapshot_preview1 import. Use the JS Entry point (SwissEph class) to handle this automatically. |

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1. Deno Examples

Standard API (Recommended)

import { SwissEph } from "@fusionstrings/swiss-eph";
const wasmUrl = new URL("./swiss_eph.wasm", import.meta.url);
const eph = new SwissEph(await WebAssembly.compileStreaming(fetch(wasmUrl)));

Deno-Native WASI

import Context from "@std/wasi"; // or native Deno.WASI
const wasi = new Context({ args: [], env: {}, preopens: { ".": "." } });
const instance = await WebAssembly.instantiate(module, {
  wasi_snapshot_preview1: wasi.exports,
});

---

2. Node.js Examples

Standard API (ESM)

import { readFile } from "node:fs/promises";
import { SwissEph } from "@fusionstrings/swiss-eph/wasi";
const eph = new SwissEph(
  await WebAssembly.compile(await readFile("./swiss_eph.wasm")),
);

Native node:wasi

import { WASI } from "node:wasi";
const wasi = new WASI({ version: "preview1" });
const { instance } = await WebAssembly.instantiate(buffer, {
  wasi_snapshot_preview1: wasi.wasiImport,
});
wasi.initialize(instance);

---

3. Browser Examples

Standard WASI (Dynamic Fetch)

<script type="module">
  import { SwissEph } from "./swiss_eph.js";
  const eph = new SwissEph(
    await WebAssembly.compile(
      await fetch("./swiss_eph.wasm").then((r) => r.arrayBuffer()),
    ),
  );
</script>

Inline Pre-bundled (Best for SPAs)

import { instantiate } from "./loader.js";
const eph = await instantiate(); // WASM is inlined as Base64

---

4. Cloudflare Worker Examples

Wrangler WASM Import

import wasmModule from "./swiss_eph.wasm";
const eph = new SwissEph(wasmModule);

Zero-Config Inline

import { instantiate } from "@fusionstrings/swiss-eph";
const eph = await instantiate(); // No external fetch, fits 1MB limit.

Detailed Caveats

Raw WASM in Browser/Worker

Warning

Direct WebAssembly.instantiate of the WASI binary in a browser will fail unless you provide a full wasi_snapshot_preview1 polyfill. We recommend using our SwissEph class which handles these mocks automatically.

Memory Management

When using the Standard API, memory is automatically managed through our WasmHeap. In Raw and Native styles, you must manually handle malloc/free if passing strings or arrays to the Swiss Ephemeris.

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Appendix: Ephemeris Calculation Modes (3)

SwissEph supports three internal models for astronomical calculations. You can specify these using the iflag parameter in swe_calc_ut.

Mode	Constant	Dependency	Performance	precision
Moshier	SEFLG_MOSEPH	None	~700k ops/s	High
Swiss Ephemeris	SEFLG_SWIEPH	.se1 files	~500k ops/s	Ultra
JPL Ephemeris	SEFLG_JPLEPH	JPL files	~600k ops/s	Industry

1. Moshier Mode (Default Fallback)

The fastest and most portable mode. It uses a semi-analytical model that is built-in to the WASM binary. No external files are required.

const result = eph.swe_calc_ut(jd, Constants.SE_SUN, Constants.SEFLG_MOSEPH);

2. Swiss Ephemeris Mode

The primary mode of this library. It provides maximum precision but requires ephemeris data files (.se1) typically stored in an /ephe directory. If files are missing, it silently falls back to Moshier mode.

eph.swe_set_ephe_path("/path/to/ephe");
const result = eph.swe_calc_ut(jd, Constants.SE_SUN, Constants.SEFLG_SWIEPH);

3. JPL Ephemeris Mode

Uses industry-standard JPL ephemeris files (DE431, DE405, etc.). Requires explicit file loading and does not fallback to Moshier if files are missing.