JS: Implement new metric queries for line counting

javascript/ql/src/Diagnostics/Files.ql

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+/**
+ * @name Total source files
+ * @description The total number of source files.
+ * @kind metric
+ * @id js/metrics/files
+ */
+
+import javascript
+
+select count(File f | not f.getATopLevel().isExterns())

javascript/ql/src/Diagnostics/Lines.ql

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+/**
+ * @name Total lines of text
+ * @description The total number of lines of text across all source files.
+ * @kind metric
+ * @id js/metrics/lines
+ */
+
+import javascript
+
+select sum(File f | not f.getATopLevel().isExterns() | f.getNumberOfLines())

javascript/ql/src/Diagnostics/LinesOfCode.ql

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+/**
+ * @name Total lines of code
+ * @description The total number of lines of code across all source files.
+ * @kind metric
+ * @id js/metrics/lines-of-code
+ */
+
+import javascript
+
+select sum(File f | not f.getATopLevel().isExterns() | f.getNumberOfLinesOfCode())

javascript/ql/src/Diagnostics/LinesOfCodePerFile.ql

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+/**
+ * @name Lines of code per source file
+ * @description The number of lines of code for each source file.
+ * @kind metric
+ * @id js/metrics/lines-of-code-per-file
+ */
+
+import javascript
+
+from File f
+where not f.getATopLevel().isExterns()
+select f, f.getNumberOfLinesOfCode()

javascript/ql/src/Diagnostics/LinesPerFile.ql

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+/**
+ * @name Lines of text per source file
+ * @description The number of lines of text for each source file.
+ * @kind metric
+ * @id js/metrics/lines-per-file
+ */
+
+import javascript
+
+from File f
+where not f.getATopLevel().isExterns()
+select f, f.getNumberOfLines()

javascript/ql/test/query-tests/Diagnostics/Lines.expected

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+| 22 |

javascript/ql/test/query-tests/Diagnostics/Lines.qlref

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+Diagnostics/Lines.ql

javascript/ql/test/query-tests/Diagnostics/LinesOfCode.expected

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+| 12 |

javascript/ql/test/query-tests/Diagnostics/LinesOfCode.qlref

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+Diagnostics/LinesOfCode.ql

javascript/ql/test/query-tests/Diagnostics/LinesOfCodePerFile.expected

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+| src/.eslintrc.yml:0:0:0:0 | src/.eslintrc.yml | 0 |
+| src/javascript_file.js:0:0:0:0 | src/javascript_file.js | 6 |
+| src/package.json:0:0:0:0 | src/package.json | 0 |
+| src/typescript_file.ts:0:0:0:0 | src/typescript_file.ts | 6 |

javascript/ql/test/query-tests/Diagnostics/LinesOfCodePerFile.qlref

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+Diagnostics/LinesOfCodePerFile.ql

javascript/ql/test/query-tests/Diagnostics/LinesPerFile.expected

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+| src/.eslintrc.yml:0:0:0:0 | src/.eslintrc.yml | 2 |
+| src/javascript_file.js:0:0:0:0 | src/javascript_file.js | 7 |
+| src/package.json:0:0:0:0 | src/package.json | 6 |
+| src/typescript_file.ts:0:0:0:0 | src/typescript_file.ts | 7 |

javascript/ql/test/query-tests/Diagnostics/LinesPerFile.qlref

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+Diagnostics/LinesPerFile.ql

javascript/ql/test/query-tests/Diagnostics/src/.eslintrc.yml

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+rules:
+  semi: error

javascript/ql/test/query-tests/Diagnostics/src/externs.js

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+/**
+ * @externs
+ */
+
+// Should not be counted
+
+function Object() {}
+function String() {}

javascript/ql/test/query-tests/Diagnostics/src/javascript_file.js

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+function foo(x) {
+    return x;
+}
+
+function bar(y) {
+    return y;
+}

javascript/ql/test/query-tests/Diagnostics/src/package.json

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+{
+    "private": true,
+    "devDependencies": {
+        "typescript": "*"
+    }
+}

javascript/ql/test/query-tests/Diagnostics/src/typescript_file.ts

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+export interface Foo {
+    x: number;
+}
+
+export function getX(f: Foo) {
+    return f.x;
+}