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lab 1207
66bb69114a
A \const X = require('./m')\ binding is an import, not a module-scope data
binding. The node it produced in the importing file shadowed the class the
required file exports, so \
ew X()\ bound to the local node and the
required class got no incoming edge.
49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
"""A CommonJS `const X = require('./m')` binding must not create a local node.
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The binding is an import, not a module-scope data binding. A node for it in
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the importing file shadowed the class the required file exports, so `new X()`
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bound to the local node and the required class got no incoming edge (#4621).
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"""
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from __future__ import annotations
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from pathlib import Path
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from graphify.extract import _make_id, extract
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def _write(path: Path, text: str) -> Path:
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_text(text, encoding="utf-8")
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return path
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def test_require_binding_does_not_shadow_the_required_class(tmp_path: Path):
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logger = _write(
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tmp_path / "src/logger.js",
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"function Logger(p) { this.p = p }\n"
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"Logger.prototype.warn = function warn() {}\n"
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"module.exports = Logger\n",
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)
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use = _write(
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tmp_path / "src/use.js",
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"const Logger = require('./logger')\n"
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"function Watcher() { return new Logger('w') }\n"
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"module.exports = Watcher\n",
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)
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result = extract([logger, use], cache_root=tmp_path)
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node_ids = {node["id"] for node in result["nodes"]}
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assert _make_id("src/use", "Logger") not in node_ids, (
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"the require binding must not create a node in the importing file"
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)
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calls = {
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(edge["source"], edge["target"])
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for edge in result["edges"]
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if edge["relation"] == "calls"
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}
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assert (_make_id("src/use", "Watcher"), _make_id("src/logger", "Logger")) in calls, (
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"the call must land on the class the required file exports"
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)
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