add typeonly example with crashing swcrc

examples/typeonly/BUILD.bazel

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+load("@aspect_rules_swc//swc:defs.bzl", "swc")
+load("@aspect_bazel_lib//lib:write_source_files.bzl", "write_source_files")
+load("@aspect_bazel_lib//lib:testing.bzl", "assert_json_matches")
+
+# Example test reproducing https://github.com/swc-project/swc/issues/7822
+
+swc(
+    name = "compile",
+    srcs = [
+        "a.ts",
+        "b.ts",
+        "c.d.ts",
+        "e.ts",
+    ],
+    out_dir = "out",
+    source_maps = True,
+    swcrc = "swcrc.json",
+)
+
+# Assert that the output of "compile" rule matches the expected file.
+write_source_files(
+    name = "test",
+    files = {
+        "expected/a.js": ":out/a.js",
+        "expected/b.js": ":out/b.js",
+    },
+)
+
+[
+    assert_json_matches(
+        name = "test_%s" % f.replace("/", "-"),
+        file1 = ":out/%s.js.map" % f,
+        file2 = "expected/%s.js.map.golden" % f,
+        filter1 = ".sourceRoot,.sources",
+        filter2 = ".sourceRoot,.sources",
+    )
+    for f in [
+        "a",
+        "b",
+    ]
+]

examples/typeonly/README.md

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+Can also be reproduced using the swc-binary. Not (yet) reproduced using @swc/cli
+
+```
+> ./swc-darwin-x64 compile --source-file-name c.d.ts --config-file swcrc.json --source-maps true --out-file c.js c.d.ts
+thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/sourcemap-6.2.3/src/types.rs:655:9
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+```
+
+```
+> ./swc-darwin-x64 compile --source-file-name b.ts --config-file swcrc.json --source-maps true --out-file b.js b.ts 
+thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/sourcemap-6.2.3/src/types.rs:655:9
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+```

examples/typeonly/a.ts

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+import { Foo } from "./b"
+import { Bar } from "./c"
+
+const a: Foo = 1
+const b: Bar = 2
+
+console.log(a, b)

examples/typeonly/b.ts

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+export type Foo = number

examples/typeonly/c.d.ts

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+export type Bar = number

examples/typeonly/expected/a.js.map.golden

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+{
+    "sources": [
+        "../a.ts"
+    ]
+}

examples/typeonly/expected/b.js.map.golden

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+{
+    "sources": [
+        "../b.ts"
+    ]
+}

examples/typeonly/swcrc.json

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+{
+  "sourceMaps": true,
+  "module": {
+    "type": "commonjs",
+    "strictMode": true,
+    "noInterop": true
+  },
+  "jsc": {
+    "externalHelpers": true,
+    "target": "es2015",
+    "parser": {
+      "syntax": "typescript",
+      "tsx": true,
+      "decorators": true,
+      "dynamicImport": true
+    },
+    "transform": {
+      "legacyDecorator": true,
+      "decoratorMetadata": true,
+      "react": {
+        "throwIfNamespace": false,
+        "useBuiltins": false,
+        "pragma": "React.createElement",
+        "pragmaFrag": "React.Fragment",
+        "importSource": "react"
+      }
+    },
+    "keepClassNames": false
+  }
+}