Package: node-unicode-12.0.0 Version: 0~20190414+gitbf518e99-2 node-unicode-data 0~20190414+gitbf518e99-2 was originally built successfully and correctly under sid, and then the binaries were imported to buster.
However, if you now try to rebuild node-unicode-data under pure buster, you will get this error during the build process: node scripts/generate-data.js [16:03:24] Worker 2 is done! [16:03:24] Worker 1 is done! [16:03:24] Worker 4 → Unicode v12.0.0 Generating data for Unicode v12.0.0… Parsing Unicode v12.0.0 categories… [16:03:24] Worker 3 is done! Parsing Unicode v12.0.0 `Script`… Parsing Unicode v12.0.0 `Script_Extensions`… Assertion failed: canonical name for Nand = undefined not present in `scriptsMap` /root/node-unicode-data-0~20190414+gitbf518e99/scripts/parse-script-extensions.js:62 scriptsMap[canonicalName].add(codePoint); ^ TypeError: Cannot read property 'add' of undefined at /root/node-unicode-data-0~20190414+gitbf518e99/scripts/parse-script-extensions.js:62:31 at Array.forEach (<anonymous>) at /root/node-unicode-data-0~20190414+gitbf518e99/scripts/parse-script-extensions.js:52:12 at Array.forEach (<anonymous>) at Object.parseScriptExtensions (/root/node-unicode-data-0~20190414+gitbf518e99/scripts/parse-script-extensions.js:26:8) at generateData (/root/node-unicode-data-0~20190414+gitbf518e99/index.js:61:18) at complicatedWorkThatTakesTime (/root/node-unicode-data-0~20190414+gitbf518e99/scripts/generate-data.js:31:3) at process.on (/root/node-unicode-data-0~20190414+gitbf518e99/scripts/generate-data.js:74:3) at process.emit (events.js:194:15) at emit (internal/child_process.js:820:12) The error is ignored, the build continues anyway and goes on to produce a node-unicode-12.0.0 binary packages that is missing many files. If you then try and use this binary, the missing files will cause other packages will fail to build such as acorn: Error: Cannot find module 'unicode-12.0.0/Binary_Property/ID_Start/code-points.js This issue can be avoided by bringing node-unicode-property-value-aliases version 3.4.0+ds-1 from sid into buster too. This new version includes the missing mapping of the 'Nand' script that is mentioned in the error message.